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I've used screen for 15 years, am happy with the functionality, and don't see the need (yet) to switch to tmux. Given that, I would rather that iTerm2 not use more system resources supporting a vterm multiplexer that I don't use. It's not going to keep me from using iTerm, though.

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That, and screen is installed on pretty much everything I use. Tmux isn't.

You can modify tmux to use the same shortcuts as screen so that you can use the same muscle memory. I've been a heavy screen user for a while and recently switched to tmux. To me, tmux felt like a breath fresh air. That said, I spent the time (~hour) to convert my heavily modified screen environment over to tmux so I'm using pretty much the same shortcuts.

iTerm2 does not use "more system resources supporting a vterm multiplexer" if you don't use it's tmux functionality.

Same goes for most all well designed apps a lots of not well designed too: code pages are loaded into memory only when they are needed.

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