Problem is that a coach is more focused on winning this year, the front office is more focused on the long term condition of the roster. A coach may prioritize a veteran with one good year left over a very young player who hasn’t had much opportunity to prove himself yet but has flashed and there’s reason to believe he will develop. For this year, yes the veteran will be better, but long-term your roster will be shorthanded after that. So it makes sense to leave these decisions with 1 person and then have the coach focus on doing his best to win with who he has - and I’m sure he gets lots of opportunity to give input in their “collaborative environment”.
If the team struggles and it’s clearly due to a talent deficiency, that will be blame laid more on Wolf than Mayo. If you let one guy make the initial decisions but then let the other guy cut it down to 53 then you end up with a lot of finger pointing. “He didn’t get me good players”, “I did but he cut them before they developed” etc.