Hello everyone, I came here researching a totally different topic and happened upon this thread and it made me register to get a reply in. By means of introductions and specifically for the purpose of providing some personal Curriculum Vitae to accompany my response/input to this thread, a little background on me. I've studied Aikido for approximately 17 years of the time I've been practicing martial arts, it was my first black belt and I consider it to be part of the core/center of my personal style and philosophy in Budo. I'm a combat veteran, I spent some time as a cop and I have been in some form of "profession of arms" since I became an adult. I've also had the opportunity to travel and train in multiple styles of martial art, in their parent countries and I have fought competitively in about a dozen professional/paid fights over the years. I'm not listing all this as machismo or to brag, merely to establish that I have qualifying experience in sport/traditional and practical application of what I am talking about and that when I speak as an Aikido practitioner I am doing so from a position of someone who has experienced fighting in its various facets and venues, with training in multiple styles and who can speak from a reliable level of expertise, assuming you take me at my word regarding my experience.
Any Aikido school which traces its lineage back to Japan is practicing post world war 2 Aikido, this is problematic for the "practicality" of the martial art in the west. Morihei Ueshiba was a war hero in the Russo-Japanese war and he won the Japanese equivalent of the medal of honor for single handedly breaking a Russian cavalry charge on his position as a lone rifleman. Once he began establishing Aikido, he was a war hero who was also a leading personality within the nationalist movement of pre world war 2 Japan. Ueshiba developed Aikido based on his experience in Judo, Ju-Jutsu, Ken-Jutsu and other specifically Japanese martial arts as a sort of finishing school for Japanese martial artists and as a proprietary "Japanese only" discipline designed to give the Japanese soldier a supernatural edge and to establish the correct philosophy of what he referred to as "Yamato Damashii" or the true spirit of Japan, but as it was seen and understood under Emperor Hirohito and the Japanese fascists.
Morihei Ueshiba spent the entire war training the Japanese military, along with most of his core apostles/students, using Aikido as a framework to blend practical Budo with a quasi-religious indoctrination into Japanese fascism/nationalism. Post war, Ueshiba became a pacifist and attempted to re-brand Aikido as a sort of national discipline which could encapsulate the new spirit of peace and the end of Japanese militarism. Once Aikido entered its post war phase/rebranding, the curriculum was edited, the teachings were watered down and much like the rest of the individual Japanese martial arts, Aikido became more about the cultivation of personal discipline and character than as an actual pragmatic fighting system.
Skip forward to Aikido coming to the states, Steven Seagal brings it to Hollywood and it reaches popularity during the big "Karate boom". Half of the schools are claiming Aikido is the ultimate combat martial art like you see in the Seagal movies and the other half are still pushing the post war "fight without fighting" pacifism. The UFC shows up in 1993 and America watches first hand as wave after wave of the countries fast food black belts get punched in the face for the first time or choked out by these super brutal kids from Brazil who have a very distinct style and actual experience in real fights. Hence today, we get a dramatic over-correction from this long search for "the best style" to "nothing but BJJ and MMA works" which is perpetuated by all the celebrity attention the BJJ world has gotten through Joe Rogan and company as well as the tried and true record of the Gracie dynasty which has now produced a long line of incredibly talented world champion level martial artists and all of their students.
The reality however is much different, BJJ is not the end-all-be-all martial art. MMA is not the only way to produce good techniques or fighters and Aikido is not simply a useless discipline that doesn't work. The reality is that we have a slovenly martial arts culture built from instant gratification where many people don't care about anything other than progress to their next belt or getting into the right "camp" to call themselves a cage fighter. While I think things today are much better than the eighties and nineties, I would still hazard an estimate that over three quarters of all martial arts schools in the US are feel good factories charging fifty bucks an hour to give people cool selfies for their instagram or a nice belt to hang on their wall, not schools seeking to train effective warriors. Aikido is simply a victim of both its own post war re-branding as well as our own problems here in the west. For a "bridge" discipline that was always supposed to be partnered with another discipline like Judo or Kendo, the basket of highly technical and situational techniques that aikido brings to the table is simply not useful or practical on its own even if you get lucky enough to find a good teacher who actually knows what the hell they are doing. Aikido is never going to be an all encompassing martial art above all others, but it was never intended to be that, even in its pre-war format that emphasized practicality and lethality, it was always intended to be blended into something else.
Where Aikido shines, where it is practical and useful, is when it is blended into multiple disciplines and like any martial art, when it is used in conjunction with practical training techniques with an active and resistive partner. What makes BJJ so great is its training methods and its consistent demand for students to apply the techniques to an opponent who is resisting. No system is practical if it is missing this type of resistance training, its like weightlifting but only ever using what weight feels comfortable at the time. If we go back to the source material, the writings and understanding of Morihei Ueshiba and his students/associates before the end of World War 2 and once we filter out the right wing Japanese fascism, we see more practical application and theory. There is, also, a surprising amount of good material in the pacifist/koombaya post war Aikido, if you understand the fundamentals of the philosophy and accept the differences as part of the overall duality of man's nature, rather than try to wrist lock your way out of your next MMA match.
Aikido is Ai - harmony, Ki - spirit, Do - way or "the way of the harmonious spirit" as a literal translation, though a better one might be "the way of the tranquil soul" but "harmonious spirit" does fit. Aikido philosophy assumes the student understands the concepts of late Edo period, contemporary views of Bushido and Zen as applied to the martial mind of the Samurai. The ultimate goal and life's work behind Aikido is to produce a truly balanced and harmonious warrior who is not only capable of killing but also of mercy and who has the discipline and expertise to choose the appropriate force to respond to an attack and the expertise to only use exactly that force necessary to achieve the desired result. A true master of Aikido is the same concept as an image of the buddha, a conceptual goal more than an image of a specific person. Through the teachings and principles instilled in the student, the goal is to create a fighter who can do what needs to be done in a war such as efficiently killing an opponent but who has the skill and personal attributes that would also allow them to subdue an armed assailant without hurting them.
So what's a "practical" example of this and how is it applied? Let's look at something like a counter to a punch. Many inexperienced or poorly trained Aikido students will absolutely stand around trying to catch a punch, this is an example of the student not understanding the technique or how to apply it. Aikido traditionally has something like 5 different counters to the traditional "straight punch" or jab, but if you look at each individual technique, it doesn't begin by trying to catch a hand or punch, it starts with the movement of the Aikido practitioner to enter/pass or blend with the opponent and to get a hand in to intercept the joint/limb being used to attack BEFORE the strike is thrown if possible. Take a look at a good explanation of a counter to a punch with a wrist lock here (not an endorsement of the content creator just this one explanation given for this specific technique because it demonstrates the correct targeting and movement):
The Aikido practitioner is learning to recognize the momentum and power in an opponents actions, to understand where that energy is generated and to intercept, redirect, deflect or ground that energy as if it were electricity. This movement and hostile geometry of the Aikido practitioner to both avoid and position the attack and counter attack at the same time is what allows an experienced practitioner to be effective, all you are doing is moving offline from your opponents attack and then attacking in line with any openings given by the opponent. Think of two dueling samurai, they both approach each other and swing their swords as they enter melee range with each other, both are trying to avoid the blow of their opponent and change their position and line of movement enough to get their sword in to an opening, the fighters are not trying to catch the opponents sword, they are attempting to avoid being cut and to cut the opponent first.
So I don't have to "catch" your punch, I have to know how to read you, see your body begin to generate the power in your hips, shoulders, etc to form and perform the punch and then I just need to get to the joint or limb doing the strike before you get the punch going. If I get in early, I can neutralize your punch before it does anything, possibly even gain control of that arm and use it as a handle to do something to you like an arm bar, wrist lock, shoulder throw, etc. This has immediate applications with other martial arts.
If you learn each Aikido technique in a controlled environment, having it applied to you at varying levels of resistance and pressure, you learn how to accurately apply the technique with a varying degree of pressure and intensity to others, as well as recognize how far you can "fight" the technique yourself without injury. If you use that knowledge to promote more resistive and dynamic uke/nage drills, you get that more challenging training against resistance that you need to accurately apply the techniques in the real world.
If you go further, you mix in another style or two like BJJ and boxing, the Aikido will help you recognize and manipulate the same things with momentum and body mechanics in your BJJ techniques. Those openings created by a half executed Aikido technique that slipped or failed, might now give you an exposed head to throw a two or three punch combination into. Work in some elbow techniques from Muay Thai and all of a sudden that almost but didn't work wristlock becomes a crisp flowing transition into an elbow strike to the opponents face from the opposite side as they move to try and protect against the joint manipulation. Any martial art practiced without resistance and practical application is just a collection of pretty postures and empty forms. Aikido is maybe more guilty as an art than others, but conceptually there is still value in that art that is both practical and complimentary to anything else. I believe this is true for all systems, if you train to use the system in a fight, you may throw out individual moves or techniques but you will find valuable tools in every system, provided you are dedicated enough to train for them and open minded enough to be receptive to them.