I'm new to this site and find the discussions very interesting! I had to comment on Alan Fraser's work, because I just attended his Piano Institute for a full week. I'm a pianist and teacher who has studied many DVD's and books on piano technique and strive to always keep an open mind. I liken the variety of opinions on piano technique to "The Blind Men and the Elephant" poem; each man has only one part of the elephant and insists that he's right about what it is, even though none of them can really see it. Perhaps the people that dedicate much of their musical lives to trying to understand and explain piano technique are the "sighted" ones, but even the sighted can never see the whole elephant at once.
That being said, it pains me to hear people who have studied this topic a great deal being dismissed and/or dissed. Alan Fraser is a fantastic teacher; passionate, committed, and unique in terms of his decades of Feldenkreis teaching. I know that the Mozart video is unusual; for what it's worth, he didn't play that way even once all week at his Institute; in this case, he's really just exploring Horowitz's piano, almost playing as though he's improvising the piece and trying to find out what this particular instrument does. He has other videos of his concert performances (Scriabin, Liszt, etc.) that are very good and obviously prepared versus the impromptu Mozart rendition.
Fraser worked with students at all levels and did what all great teachers do; he listened and addressed each person's strengths and weaknesses, integrating his own beliefs about technical options based on the repertoire being played and any physical inclinations that might get in the way. His books are extremely well thought out and well written, and although he definitely has strong ideas about how the body is designed to work he is not dogmatic.
So, please don't judge people who are trying to do good things for other pianists based on cursory glimpses at their materials - give them a chance! In the cases of Seymour Fink and Alan Fraser, both of whom I've seen dissed here, they have done considerably more homework than most people and deserve credit for that.