I have to wonder if the difference is because the latter is the better practice, or because they have already done the basic practice and don't need to do it an

I have to wonder if the difference is because the latter is the better practice, or because they have already done the basic practice and don't need to do it anymore. In other words, is it necessary to go through the rote work of practicing basics before becoming a pro? I would guess the answer is yes. It would be far more telling to track many people, from beginner through their musical (in this case) careers, and determine who became pro and who didn't, and what their practice was like throughout.