Not necessarily. I occasionally pair with someone, though it's not enforced or even suggested in any way, just a result of discussing a problem for long enough

Not necessarily. I occasionally pair with someone, though it's not enforced or even suggested in any way, just a result of discussing a problem for long enough that one of us says "wanna pair on this?". We use either tmate (a fork of tmux specifically for pairing) or a VSCode plugin, depending on whether what we're pairing on. I can very much recommend tmate.