Any future Celtics success is based on players not currently on the roster. Except for maybe someone like Jaylen Brown.
It's a bunch of good contracts (expiring soon) decent players, one dude going crazy and having an awesome season overachieving in a crap conference. If the Bulls beat the Celtics is the even a conversation?
Maxing IT would be the dumbest move ever, so he's gone.
All the Celtics have from a "we can win a title' standpoint is draft picks and potential trades for good players.
Current Jazz roster is better and built more for the future than the Celtics. We don't have a million draft picks, that's the only difference.