When I learned to fly, roughly 47 years ago, it appeared there was just one way to do things. Pretty well all schools and instructors taught the same thing.
Whether it is a failure of passing down the wisdom or that too many people have too much time on their hands or . . . whatever, it seems these days that every Tom, Dick and Harry has a "brand new, all singing, all dancing theory" about a 'new way of doing things." Some of them make no sense at all and some of them are downright dangerous. The old teachings may have been marginally incorrect but the practices that stemmed from them worked, day in day out. Some of the new teachings are just downright stupid, eg, I have seen it written on an aircraft site that it is the vortices that keep an aircraft in the air. Hmmmm.
Personally I am against overbearing regulation and for free speech but one has to wonder if our authorities should insist that only proven theories and practices are taught and lay down just exactly how.