Ok, so, no sarcasm here.
I've actually gone into it quite a bit in recent weeks. The real quick summary of my general take: our offense relies too much on 3pt shooting, cannot score when shooting goes cold, our leads are fragile and we don't show mental toughness. Also, Brown has poor in game management skills (beyond just the challenge thing).
Basically, the league figured out our offense from last year and Brown has not shown the ability to counter. We get both out-coached in-game, and out schemed too often for me to have confidence in Brown going forward. He's a good coach with big limitations. He's an amazing culture guy - that's extremely valuable, but for the stated reasons, I would consider replacing him if there was a better alternative - who might actually already be on staff.
I haven't really heard a substantive counter - surely I cannot be the only person noticing these patterns. And I get it, Coach Brown has done great things for our team. But there are other people on staff that have also done great things for our team - all the way up to the FO.
We'll see what happens after the trade deadline.