ktm,
I said that to show you that renowned musicians are the ones who put more feelings and expression in their playing. The technical side of music is basic to becoming a good musician.
Every professional pianist can play, for insance a piano concerto by Rachmaninov, but not all play it well. The ones who can express themselves better, are better.
I gave the example of Horowitz, because you said that music is not just expressing expressions. If it wasn’t about expressing emotions, I wouldn’t be listening to Chopin or Beethoven any longer!