Following a first-round exit, the Boston Celtics entered a pivotal offseason. With the draft and free agency approaching, it’s a good time to answer questions from the readers.Here is Part 2 of our Celtics mailbag. Part 1 can be found here.Questions have been lightly edited for length and clarity.What is it about Jason Tatum and his game that makes him so untouchable in any possible trade scenarios? I would argue we lost to the 76ers because the team reverted to being Tatum’s team in play and coaching decisions and not Jaylen Brown’s. I’m not convinced Tatum just wants to win. I don’t have such doubts about JB.I think a Tatum trade for Giannis Antetokounmpo would be the culture and roster change that could make Boston competitive with San Antonio and OKC going forward. I’ve made my case for such a trade; if you were to put a trade out there for Tatum, what would you look (for) in return, and why? — Tom D.We’re starting Part 2 of the mailbag with a 102 mph fastball. I’m at the plate waggling my bat like prime Gary Sheffield.Let’s start with the Philadelphia series. I would argue that it wasn’t Tatum’s fault Neemias Queta lived in foul trouble, or that the big man’s backups weren’t high-level playoff performers. If the Celtics “reverted to being Tatum’s team in play and coaching decisions,” that wasn’t entirely on him, either. Tatum didn’t decide to minimize the players like Hugo González and Baylor Scheierman, who helped forge Boston’s identity throughout the regular season; head coach Joe Mazzulla did. Brown sure seemed to think Mazzulla should have trusted in his depth more often during the first round. If the Celtics changed their style because Tatum was back — well, of course they did. He’s an All-NBA player. You evolve for guys like that. Two bigger problems against Philadelphia were that he still couldn’t reach top gear after his injury, and Boston’s offense stopped functioning without him. The Celtics scored 100.9 points per 100 possessions during the playoffs with Tatum on the bench. That’s a problem. For the sake of reference, the Thunder have scored 117.1 points per 100 possessions throughout the postseason without Shai Gilgeous-Alexander on the court.Regardless of what individual goals Tatum and Brown have, they have produced a career’s worth of evidence that they do little but win together. Of course, the first-round exit was a disappointment, but it was the first time the Celtics lost at that stage when both of them appeared in a playoff series (and you could argue they would have won Game 7 if Tatum had played). You’d better be right if you break up a duo with their track record of success. I don’t know why so many people consistently clamor for the Celtics to break them up. Though some of the recent playoff defeats have been baffling and call for self-evaluation within the organization, the culture has been a huge net positive overall. Not many organizations could have stayed competitive after losing as much talent, basketball IQ and leadership as the Celtics did last offseason.Tatum should be the Celtics’ most untouchable player. He has made first-team All-NBA in each of his last four qualifying seasons. Not many 28-year-olds have been more accomplished. He still needs to prove he can unlock his top gear after the Achilles injury, but his play this season surpassed all reasonable expectations and should leave the team with plenty of optimism about his future.I would move him for Victor Wembanyama, though, if the Spurs called.Does Boston have enough physicality for the modern NBA? In the playoffs, the officials seem to allow defenders to grab and hand-check a lot. The Celtics depend a lot on Derrick White and Payton Pritchard, who are smart, focused competitors, but not that big. (Queta) can be pushed around. And for all the good stuff about the new young wings, none of them is all that stout. Maybe Hugo will get there in a year or two. Is this (team) just too thin? I think we miss a Jrue Holiday-type player and a big who could be as physical as Al (Horford). — Ted L.I sincerely hope this question came from Ted Lasso, though I have my doubts. If it did, you’re onto something, Coach.