The feedback process of listening to the music you’ve created is almost as important as the score itself, which to me feels like a guide. Sure you can play the right notes in the right order, but smaller tempo and pressure adjustments are made by feeling the music. My girlfriend played piano for years and hated it, she can play almost anything, but it sounds horrible because she isn’t listening to and interpreting what she plays. That is where the joy of piano is for me.