I stopped using tmux when I started using kitty terminal with native split windows. I prefer the native window management of kitty, but I do miss the session saving of tmux (e.g. if I accidentally close a tab).
There are many separate session persistence daemons: dtach, zmx, hauntty, shpool, diss, abduco - take your pick
Recent versions of Kitty have sessions. https://sw.kovidgoyal.net/kitty/sessions/
but I do miss the session saving of tmux
Interesting...I kinda thought that was 90% of the use case for using tmux.