Did you watch the games? If you did, how could you say these things? Jaylen Brown had every reason to complain about the refs. They simply refused to give him the calls that they gave other players. Brown is treated like a rookie when he drives to the hoop. Hell, the whole Celtics team gets treated like rookies.
Let;s compare Brown to the king of the free throw line: SGA. Here are the number of free throws for the two:
FTA/FT
536/426
814/540
Those numbers are pretty significant. But wait, it gets better. Here are the number of shots attempted:
FGA/FG
1543/736
1321/731
So even with 222 fewer shot attempts, SGA got 114 more free throws. To be honest, when I looked at the game logs, I felt like I needed to look up the refereeing crews, because there were games when Brown got the calls, about a third of the games at a glance, which is a lot higher than I would have thought watching the games. I might be that even in the games where he got to the FT line a lot, he was fouled even more.
And don't get me started on "if they stopped complaining, maybe they'd get the calls" BS because a lot of players and coaches complain just as much as Brown and the Celtics.
As for Brown's free throws, he significantly improved his free throw shooting this season (.795 vs .764). I do wish it were higher but he got better and that's not easy at his age.
I don't agree with the dig at the coach. They were the #2 seed in the East because Jaylen Brown put this team on his back and the coach played his entire bench, game after game. Mazzulla was a great coach... until Tatum came back. He seemed to change when Tatum came back. Was he pressured to do things differently? We'll likely never know.