Just like professional pitchers throw a ball with different mechanics, so do disc golfers throw with different forms. That doesn't mean the same principles that makes a curveball break or a fast ball appear to rise don't need to be incorporated into every pitchers' stuff, regardless of their larger mechanics.
Beat you to that one.
The entire backbone of the Blake/Beto philosophy is that everyone is different, and everyone will have a different looking throw. If you bothered to read any of the literature behind the video you would know that.
Developed my throw before I ever saw that video. Didn't throw like that when I first saw it, so why would I read up on it? Who'd a thunk some grainy youtube video would have a manual as well?
There is so much hyperbole in your summary of the argument that it looks like you don't really understand what the argument is...or that there really isn't one. We all know people learn differently. You haven't provided an alternative method other than trial and error yet, and I can tell you that the Blake/Beto method is much better than that for most people.