Probably the very beginning of technique is just another copy of what has been done before. People don't change, they do similar things to what they did 500 years ago and put a fancy name on it. Take for example, french TV: they're constantly showing things on the news as if they're the result of someone's amazing imagination. "We have discovered that children learn better whilst having fun" original-huh?
I think that it would be extremely boring if bernhard just posted a link to chang's book every time someone asked him a question! He does have a talent, or should I say, and acquired skill for convincing people of something because he tells it in a creative intelligent way, backed up with examples, experience etc.
Learning the piano is an extremely personal matter! Singers are more aware of the difference in technique because their body is the instrument, but pianists alike should think of their "configuration" as being unique, and that they should apply to themselves what works. Therefore comes the need to have a teacher who can comunicate to you and make YOU do things that you couldn't before. I discovered reading one of bernhard's posts that I was doing anyway what he was saying, but taking longer to achieve things because I didn't know what I was doing.
In my opinion, people who glorify Hanon (this is not supposed to be criticism) already do what Bernhard says, as I found out, that is, concentrating on moving the arm in the direction of the movement etc., basically, they naturally do what they should. It's like Alexander Technique; most people struggle doing things because they always do certain things the wrong way, but some people might come along and say they aren't difficult because they don;t have the problems in the first place. Bernhard is probably like "remedial" teacher. Points out the obvious things you are doing and tells you why you do them and how they can be improved.
Of course you shouldn't worship one person because we are all different and understand things in a different context. Being original in this context is explaining something in a way that a person "discovers" something from a new approach.
I might sound sexist, but I think that's one od the main reasons girls often have more trouble with maths. Our brains do work differently depending on our gender, and guys are bad at doing certain things which girls do naturally etc. They just can't work out the logic behing mathematics somtimes because that is not accustomed to them.
Same for us. We don't always like what bernhard says because he says it in a way we've never been told before. I get it pretty well, but then make it part of what I know already. Old technique shouldn't just be chucked out. They are misunderstood because they were formed in different environments from nowadays, and should be treated with caution. They nonetheless work in their own way. Just like bernhard does, and what I like about him is that he is persuasive, but leaves your opinion to yourself, doesn't try to sell it to you.