I used tmux for quite some time, and just stopped using it one day. I realized that whatever tmux brings can be done better by a good terminal.
I also hated dealing with all the wrong colors, escape character support, missing chars and messed up terminal buffers
Most modern terminals have a built-in multiplexing anyway. When you use tmux, you're essentially using a terminal emulator on top of a terminal emulator.
Wezterm for examples has panes in addition of tabs and scriptable enough (lua) that you can session management:
https://fredrikaverpil.github.io/blog/2024/10/20/session-man...