The problem with Simmons right now isn't shooting, it's maturity. Some of the blame lies on the organization. They finally ended up with Simmons + Embiid, but the stink of the process has not prepared them for playoff basketball. Maybe next year.
Stephen A. Smith going off on Brett Brown is comically exaggerated. Brown didn't make Simmons put his head down and run into Embiid with the ball bouncing behind him. It's not the coaches fault that he scored 1 point last game.
He's young, it's fixable, but playoff basketball has exposed him.