Actually, what you have been shown has been taught as a 'block' and demonstrated as a block and indeed in some instances might even be used as a block.I was always taught blocking in any martial arts that I have done. I was also taught evasion, when I first heard that some martial arts do not teach blocking at all I was quite surprised, I mean why would you not block. Many arts such as Muay Thai and boxing et al get along quite well without doing much blocking but one thing I have noticed is that the fighters in these martial arts tend to get hit a lot so they rely on being able to take a hit. In a street self defence situation you cannot afford to get hit even once, there have been many one punch deaths in recent years. Evasion is much easier on your body than blocking but requires more time and energy and after the strike is evaded the opponents momentum and direction of movement remains largely unchanged. The great thing about blocking is that you can redirect the attack wherever you want it to go. A good block will not only redirect the attack but will also damage the attacking tool, even to the point of breaking the attacking arm. You can also strike at the same time as you block. The are some techniques however that you should only block as a last resort, such as a hooking kick or crescent kick and it is better to evade.
Would I ever use the blocks I teach in a bar or street situation? Most definitely YES, otherwise why learn and teach them.
Why would you not block? I have no idea why you would not block. I mean, in play, threaten to hit a three year old child with a noodle and they will throw their hands up to protect their head. I play 'karate' with my grandchild. He must be smarter than most because he can block any attack without being shown. I have never said you don't block. But blocks are based on reflex. We call it the 'Oh, s#1t' reaction. If you need to block you will do it by reflex. How many 'blocks' do you know to protect your head? There must be at least half a dozen. If I go to hit you in the face hard and fast, which one will you use? I will guarantee that you won't use anything you were taught. You will protect by reflex action the same way as every other fighting system does. So, for me, the only time I would actually block an attack, that is stop the attack, is when I have been caught off guard by surprise and the survival instinct kicks in. Now I am at a disadvantage because by stopping the first attack I have precipitated the next.
So, I contend that the 'blocks' we are all taught are not blocks at all but techniques to deal with attacks that you see coming. This normally will involve deflection and may involve tsabaki.
Your analogy of Muay Thai is quite good. They do get hit a lot and the chances are in an all in brawl you will too. Not protecting yourself in a fight gets you killed. Muay Thai fighters spend a lot of time trying to protect their heads with their arms, particularly against elbows.
One punch deaths caused by the punch are extremely rare. I have never actually come across one. Hitting the head on concrete after one punch is unfortunately quite common.
The great thing about blocking is that you can redirect the attack wherever you want it to go. A good block will not only redirect the attack but will also damage the attacking tool, even to the point of breaking the attacking arm. You can also strike at the same time as you block.
Let's define 'block'.
"b : an obstruction of an opponent's play in sports; especially : a halting or impeding of the progress or movement of an opponent in football by use of the body".
So after you stop an attack, redirecting is difficult and you will most likely have a second attack on the way to contend with. A good defence ​will not only redirect the attack but may also damage the attacking tool, if we choose that option as part of our response.
I doubt very much that you would.Would I ever use the blocks I teach in a bar or street situation? Most definitely YES, otherwise why learn and teach them.
Why would you learn them and teach them? I really think you need to think about that yourself. For me, I learn them and teach them as the kihon or basic form of receiving an attack. But what we are teaching is an Uke, not a block. :asian: