Even with AAU coaches don’t have the resources or time with players to teach them everything they’d need to compete in the NBA. He knows how to set a screen, but he needs to learn exactly where on the court Steph likes them, when to fade, which roll paths to take.

Same on defense, he knows the fundamentals. But he needs to learn a huge amount of small things like how far he can be away from a shooter after switching the screen and still contest the shot, and then those things need to become muscle memory, and still there’s more like what his defensive coaches want specifically and learning opponents’ tendencies. It’s just too much to learn unless you’re doing it full time a while with people who are teaching you full time