That's what it is that you rehearse - the making of music, not the playing of notes as abstractions.
“An anxious unrest, a fierce craving desire for gain has taken possession of the commercial world, and in instances no longer rare the most precious and permanent goods of human life have been madly sacrificed in the interests of momentary enrichment.”
“I tell students, 'If you are learning from YouTube I almost don't want to teach you because what you learn from YouTube it takes 10 times as long to unlearn.' They do an approximation of the centre of the note, an approximation of the interpretation, a cloned version.”