[caymanjim]

What does this get you over simply attaching to an existing tmux session? You can already SSH into a machine and join any existing tmux session, or better yet, create a new session from an existing session, and get independent viewports and parallel input, or shared, depending on which window you're looking at.

[bitbang]

You can quickly provide a shared session connection to an external third party, so they can access computers that are not publicly accessable and that they normally would not have access to without having to do any credential management.

It's great for tech support.

tty-share is also good https://tty-share.com/

[whateveracct]

I can run tmate in my laptop and a teammate can join.