- The hands do what they are told. In the Jazz world this is known as "chops".
- The hands do what we hear internally. In the Classical world this is known as our "musical imagination".
- The big question for me is how do we enrich our musical imagination in order raise the level of our performances? The answer to that question will determine what we need to learn technically.
My best answer?
What we hear comes from our education and cultural experiences. So, more education more cultural experiences=more imagination. And, putting in the time on the piano bench over a lifetime.