The author of Kitty, Kovid Goyal, calls running tmux on local sessions an “anti-pattern” in the linked GitHub issue. I can’t help but find that a bit ironic, because the very first time I tried Kitty, I was in the middle of work when I discovered Arabic support was broken - https://github.com/kovidgoyal/kitty/issues/536 . I simply launched the macOS Terminal app, attached to the same tmux session, verified my Arabic text rendered correctly, and then closed Kitty. Without tmux, I would’ve been forced to recreate my entire workflow from scratch.
Anyone calling anything an anti-pattern without evidence always sounds to me like 'I don't like how you do this, but I need to find a more cerebral way of describing that so I don't sound like a child.'