My fellow piano aficionados, please think of your favorite recording of a monumental work (e.g., Rach 3, or Liszt B Minor). Do you like or agree with the pianist's interpretation of every bar, every phrase, every minutia?
I certainly don't when I think of my favorite. I probably disagree with the articulation at bar x, or the rubato at bars x-y, or some other minutiae here and there.
Then why do I still consider the performance and the pianist superlative? That's because of the totality of his musicality and virtuosity, which is predicated on his level of secure technique and memory, and the time he needs to prepare for such a performance (the less time he needs, the more capable he is).
There could also be a performance I don't like overall in terms of idiosyncratic interpretation (needless to say, there are many minutiae I don't like); however, if the performer's technique and memory are secure enough, and he doesn't need much time to prepare for that performance, I must admit he's a really good pianist.
Generically speaking, in higher-level study and pedagogy, teachers spend most of the time in lessons pointing out and "correcting" the interpretive minutiae they don't like in each piece students play, but teachers don't have effective instruction and advice for students to upgrade their fundamental pianistics (security of technique and memory, duration of preparation).