> tmux is great but it's way too powerful for the 90% use case of screen - which is "let this process continue to run even if I disconnect or logout".

I guess, but does it really get in the way?

I use tmux only for scrollback and having multiple "tabs" and sessions, and not much else. But the more advanced stuff like splits and whatnot never really get in my way.

Along the lines of Mosh, I've migrated from it to Eternal Terminal (ET): https://eternalterminal.dev

If that is literally the only thing that you need, dtach is the ticket.

Even screen is too powerful for that use case. Just use nohup or dtach instead.

Screen has some obscure functionality that tmux doesn't have. Handling serial port connections, whereas with tmux AFAIK you'd have to use minicom.