For me personally tmux giver minor improvements (some of them are done by some terminals, some are not), e.g.:

* Text selection using variuos shortcuts (usually I use it only for URL):

https://github.com/tmux-plugins/tmux-copycat

* FZF autocompletion from output, e.g. in case I want to diff some file I see changed in `git status`:

https://github.com/laktak/extrakto