Six months ago, before I started Karate, I thought there was Karate. I knew that TaeKwonDo was korean and different and Tang soo do and Judo, sometimes called jujuisto, BJJ. In the 60's I was at an Air Force School and we had Thai solders there for training anf I knew they could kick box. That was the world of Martial Arts for me. I also thought that every Karate school taught the same moves. Boy, I can see that I was very ignorant.
At the Dojo I found this list on the wall, Pedigree 1. The style I am studying is on Pedigree 2. The chart is probably out date and there are more styles. Especially when you add that two Dojo's may claim to teach the same style but in reality they are difference from each other. Some difference may be minor, but other may be bigger. I guess if they know there are major differences they call it a new named style.
Since the new changes, additions, corrections are recent they don't have hundreds of years of tradition and application behind them just the new leaders personal ideas of what is an improvement.
So in Karate alone there are virtually an infinate varity of styles and the number of styles is growing every time a Sensi decides to "improve the Karate" they are teaching? Not to mention other martial arts from around the world. I even saw an article on the style of martial art practiced by Batman in the movies!
I really had it wrong. I am learning more and more about less and less. I once met a college professor who was an expert in the first 7 minutes of the renaissance.
So, is the above basically correct?
Well, yes, and no.
Yes because as you say anyone who's been at it long enough (and even some who don't) can make its own school. As applied to kaate, Ryu means "school of thought" insofar I understand (which of japanese, is next to nothing
. Some schools flourish and prosper, some disappear, many stay midway. By all accounts Shotokan is the most successful and practiced school, but there are - as you have discovered - dozens more (and the nomenclature blurs very quickly, as in the many "shorin" school that exist). Think of what happens to language - people share the same language but say things like "we don't speak as they do in that city". Each school put emphasis on certain combat systems (the katas they practice) and may have slight variations in the execution of both katas and basic techniques. Again Shotokan introduced perhaps the biggest changes, intending to "de-weaponize" the combat systems and use them more for their fitness value than their fighting one (and later on, introducing new kicks and of course the sport/competition ideas, which completely changed fighting distance and thus the meaning and value of the various techniques).
No because karate in its essence is the distillation of centuries of discovering the most efficient and effective body mechanics to reach a specific a goal - incapacitate one or more aggressor at close distance, and gain enough time to escape (or to protect the king, as it were). And since the human body is pretty much made in a certain way, the fundamental body mechanics don't change much. This is the same for all martial systems with or without weapons with enough history and rooted in real confrontation, from the Chinese ones to European fighting styles from Rome on (and probably also the ancient Greek ones, and Persian, and Egyptian and so on).
So all karate is karate - it's knowledge on how to deal with a specific situation with the least consumption of energy (because another situation can be around the corner, and if you're out of breath you die) in the quickest way. If it all was forgotten and people had to reinvent it all over because for some reason they don't have guns, you would end up with completely different names but the same techniques.
It is _exactly_ because that type of fighting (no guns, but hands and legs or at most swords and knives) doesn't happen that often anymore (and thank goodness!) that we can see so many styles as deeply different even if the difference is details, and why also the knowledge of which differences are really significant is a bit lost.
Ultimately, there's only karate: the fundamentals are similar to each and the gigantic tree of possible developments that come from applying these fundamentals is so big that each style takes a small subset (which is in itself very effective) and focuses on that.