I absolutely agree with you Pianonut. In fact, for example, I am working on a nocturne, op.48 no. 1 and I decided that in the last section, I was not able to bring out the contrast between the upper melody line and the low octave harmony changes. To try and figure out how I might go about doing this, I found a recording, sadly my only one, of Ashkenazy playing it, and to my surprise, not only was I unable to find the solution to my question after many slow and repeated listenings, but I found that in my opinion, Ahkenazy himself did not do a good job of separating the two. Of course, the music itself was technically perfect, but after working on the piece myself and coming up with my own expression of how it should be played, I found Ashkenazy's way to be wrong. Dont take this the wrong way, I am in no way saying that Ashkenazy is anything short of amazing, or that my opinion of how the piece should sound is better than his. This is only to say that technically, I can play the notes just as well as he can, yet we both have two completely different ideas of how they should sound, just as I am sure this happens with almost anyone who plays a piece of music for a long time and really tries to perfect it. To me, it seems that musicality has to be more important, because it is more subjective, more personal, and therefore, in the end, I believe more telling of the pianist themself.