Hard disagree with your hard disagree. Any skill benefits from dedicating yourself to it full time. Yes, there are talented amateurs, but they're on the tail of the distribution. There is a selection bias because you don't tend to see all the mediocre work produced by untalented amateurs.
Who is likely to be the better piano player, the accountant practicing 5 hours a week, or the concert pianist practicing 30 hours a week?
Who is likely to be the better piano player, the accountant practicing 5 hours a week, or the concert pianist practicing 30 hours a week?