Sure but he & Tatum needs each other. I know he seems to be the scapegoat right now but a lot of things went wrong this series but he's the easy target.
When JB is telling everyone that he is the best two way player in the world and the leader of the team, he deserves the blame. Tatum does not need JB. Pair him with Giannis, Kawhi, KD. If Boston had any of those guys instead of Brown they likely advance to round 2.
he deserves some blame but I give the bulk of it to Joe for p----poor coaching (completely unable to adjust on the fly and that starting game 7 line-up should get him fired) and White for being a complete non-factor the whole series as well as some of the blame to PP for having a Jekyll and Hyde series, Hauser for essentially contributing nothing in the series, Q for not staying out of foul trouble and Walsh for still not being able to do anything on offense. Add some to Tatum for having a lackadaisical attitude for the games he did play.
Plenty of blame to go around. this wasn't just on JB by any means
Agree that it is not Jaylen.
I am less critical of Mazzula. Primarily, I put this down to the players under-performing and not the coach. Queta & Vooch underperformed. Hauser, Pritchard & D White underperformed. J Walsh underperformed. Baylor was quiet. Jaylen was so-so. Jaylen is way down the list of problems in that series. So is Mazzula for me. It was primarily a player-issue. Not a coaching-issue. Too many guys did not perform.
It was not Mazzula's fault that Queta kept picking up silly fouls. It was not Mazzula's fault that J Walsh couldn't make a shot. It was not Mazzula's fault that Vooch got hurt right after joining the team and never got settled in the team. There are some things Mazzula could have done to help Vooch offensively but the main cause was the lack of games / reps Vooch had with his teammates. It is not Mazzula's fault that D White was averaging something like 8ppg 3apg 5-6 games into the series while shooting 30-something% from the field and 20-something% from 3. It is not Mazzula's fault that Pritchard was up and down in the series.
With the shooting going in the tank for the final few games, it made life more difficult for everyone else. Including Jaylen. Philly could help more on defense. Take more risks. Shrink the court more. Force BOS into harder shots. It had knock-on effects.
Mazzula did some things I don't like in the series. The Game 7 starting lineup was #1. Not making more of an effort to get Vucevic involved in the offense is #2. Sticking with J Walsh so long when he was misfiring is #3. But I don't see Mazzula as one of the main causes of BOS' exit from the playoffs. It is more about the players to my eyes.