I find this definition of ‘success’ shallow as well as self-defeating. Shallow because it defines an end point rather than if the pianist plays with musicality and technique. It is self-defeating because the emphasis in on the wrong goal, so a student rushes through where they actually are in order to run faster to the false goalpost. In the end, you have Simone who plays a bunch of notes. Big deal.
... None of these are super virtuoso pieces, but the small audience loved it. One woman, a dairy farmer, was in tears and told me it brought back her whole youth. People who had never heard of Janacek were turned on to him. That's success in my book. And I get to spend 3 hours a day working on great music by great composers. There's virtuoso stuff I'll certainly never be able to play. But if I'd let someone dissuade me from starting, 20 years ago on the grounds that I'd never be a "success," it would have been a personal tragedy.
I would feel really hollow if I found out that it's unlikely I will ever be able to play them well because I've passed a critical window of learning opportunity or some other bs reason, and I might as well rather just give up trying to play the piano.
I think of being successful as being able to produce on the piano anything that I can imagine.