If they can't execute during games, that is on the coaching.
If they can't play with composure, that is on the coaching.
If they let their play on offense dictate their play on defense, that is on coaching.
If they constantly forget to box out for rebounds, that is on coaching.
If they constantly let their player blow by them for easy baskets, that's on coaching.
These are all things a coach is supposed to do. Help a team prepare for games and put them in position to win. When they make the same mistakes repeatedly throughout a game, across games, and season after season...that's also on coaching.
If that's not on coaching, what do you purport the role of the coach is supposed to be?
Truer words were never spoken !!!!!!