I think the most important aspect is the ability to think. In order for that to matter, of course, there has to be a solid fundamental basis. By that I mean balance, punching technique, and a basic understanding of defense. But watching tape, going to the fights, discussing what you are seeing, putting everything into the proper perspective: You never ever ever in a boxing ring do something just to do it. There is always a purpose.
All the stuff about where to hold your hands etc.. will take care of itself, given the proper basis fundamentally and mentally. Each individual will adapt a style that suits them IF they have the proper foundation. I think that, in this age, many guys do things "naturally" (and/or incorrectly/stupidly) because the person that 'taught' them didn't give them the reference points necessary to begin thinking for one's self.
Great post Thomas. I hope this one goes on for awhile.