[pavel_lishin]

No, I definitely use tmux for that stuff instead of whatever my terminal app has built-in - but usually I only have a single iTerm2 terminal open for my local tmux session, and any new windows or tabs are either meant for remoting into other servers, or are quickie one-offs that I explicitly don't want to connect to my "main" tmux session.

So when I hit CMD-T or CMD-N on my local machine, I don't _want_ to be connected to my tmux session, since I'd just have to hit `D every time to disconnect, and then run "ssh elsewhere" and connect to tmux there.

[boffinAudio]

I think where you're getting confused is that you're replicating local functionality that iTerm2 offers (cmd-D for a new terminal session) versus tmux features that are important and useful when used on a remote host.

Using tmux on a remote host means that you can always detach and re-attach to the remote host session when you want to. You can do that on your local host too, but this is only useful, ultimately, if you have long-running process that you want to leave running - and be able to re-attach to - while also being able to quite iTerm2 completely ..