I think its actually the play style.This is dumb. The solution is scaling back the AAU-type nonsense. Stars are playing too much before they hit college or makeshift semi-pro & pro leagues. it's too much wear and tear on their bodies
Old school players used to settle into a more back to the basket style of play as they got older.
Meanwhile modern players are doing stepback after stepback. Euro step after Euro step. There is no way going full speed in one direction and suddenly going in the opposite direction is good for you.