Earlier quoted context omitted.
> If you're picking up basketball at age 30, I hope you know that you're never going to be anywhere nearly as good as Curry, or Lebron Well, I hope so, too. However, in basketball, the really good players aren't even going to let you play with them, so you're forced to play with people your own level. In music, you're constantly hearing 8-year-olds who are better than you will ever be. I believe it's the motor skills…
In music there's also the stubborn belief that anyone who's older than 8 is too old to learn, and the idea that the goal of music lessons is to train professional musicians and anyone over 8 is not going to be ready at college age and has to pick a different job anyway.
Lots of parents think it's important for their kids to learn music, actually, with no thought that they'll become professionals. In fact, most of them would be horrified if that happened.