Not me. He is the reason I'm a Boston fan today.
He is literally my hero.
The narrative for Stevens as a coach at the end was that he had lost the locker room, his message was no longer getting through to the players, and some of the players were mentally checked out and didn't listen to him. I suggest we consider where that info was coming from (the Boston media), which typically concentrates on the negative side of pretty much everything. However, I think the reality of the situation was some of the players weren't on the same page and / or were not great locker room guys and it was a player fit / harmony / culture problem.
If I had to guess, I would suggest Smart and Grant Williams weren't great team players (like Kyrie before them). I know a lot of fans loved Smart, but to me he seemed like he declared himself an equal and integral part of the Big Three while viewing himself as an on-court coach and the team's leader. Many people have suggested Grant never stopped talking and voicing his opinion from the first day he got there. Also, Kemba Walker seemed very indifferent and seemed happy to cash his sizable paycheck (he made $67 million over his two years in Boston). Maybe that's unfair to Walker and his balky knee, but I seem to remember him in and out of the lineup quite a bit and him always being day to day with knee soreness (and him tapping out in the playoffs).
Maybe the team does relate better with Mazzulla, but the team's attitude and performance seemed to get better without Smart / Williams / Kyrie and maybe a couple other players I can't remember on the team.