If you're interested in an out of the box multiplexer. https://zellij.dev/ is great. I've been using it for about a year now and loving it.

Your out of the box isn't my out of the box. Tmux is in main on OpenBSD, where it started.

	▲	rgoulter 2 days ago \| parent [-]
		I read "out of box" as meaning "has sensible defaults, can be used 'out of the box' without configuration". I've never seen it used to mean "preinstalled on most systems". Although e.g. people like vi keybindings because vi is preinstalled on most systems. Either way, I think you can argue for workstations, it's worth configuring software to your liking, and worth installing software that helps you be productive. Though, the only software I've seen people excuse for having 'bad defaults' have been things like vim, emacs, tmux.