To be clear: My assumption that Simpson is (still) a bad jumpshooter is not an insult, an indication I dislike him, or that I don’t value his contribution.
Players get open shots for two reasons: the offensive system creates them for the player, or the player creates them on their own
We all know Simpson was not an off the dribble shooter, and yes, I think the fact a player who has the ball in his hands more than anyone else doesn’t take an off the dribble shot is an indication he does not wish to.
His lack of shooting also shows that Beilein, largely, opts not to get him the ball to shoot in open situations. Wagner got open shots because the offense was designed to do so (b cause he could make them). Ditto Robinson.