There also may be a world where he is a good developmental coach to a point... like maybe he makes good college players look like great college players, but struggles to develop payers to the point where they can play in the NBA.
I have *never* been a fan of system coaches. It's actually why I liked Ty Lue the first year-and-a-half and disliked Blatt. With Lue, our offense and defensive strategies changed every round. Blatt, meanwhile, struggled to get the players to buy into his system. Obviously Lue got worse, but unless your Pop or have Steph Curry, there are basically no successful system coaches in the NBA.
I like Beilein's philosophy and I think he's analytics friendly. That's why I support the hire. But I would be lying if I said I had no concerns. He definitely has a "system" and he does not produce a lot of producing NBA players. I am honestly interested to see how this works.
And, just to be clear, "ball movement" or "motion offenses" are totally different than being a "system coach."