One negative in hiring an older college coach with no NBA experience like Beilein is that he may overvalue guys he would want on his college team rather than getting the best future NBA players. So a guy that works hard with decent skills in several areas that is closer to a finished product is going to be favored over the guy with untapped potential that may never do anything. The attitude that if you gave me a college team with Hunter, Grant Williams and some grinders I could win an NCAA title, so I can win an NBA title with those guys too.
Think you are underestimating Belein's knowledge of the pro game.