TUIs work where I do. I don't want to juggle another window unless I need to. Tmux gives me better ways of organizing my work than most display managers. Most of the useful things I do end up calling other shell commands, and it's nice having terminal right there. Ctrl-t / fg are also uniquely powerful.

UIs are also useful for information that is best represented in a UI. keep using those too.

You can bend each to be more similar to the other, and that's good too! Sometimes there is a good use case for that.