That's a little bizzare, but ok. Gnu screen has low latency, works well on Linux and bsds, works well with vim and emacs, works well for pair programming? I'm not sure how good the mouse support/sharing is - but I think selection and cursor is shared fine?
Don't get me wrong, I've got lots of colleagues who use various other editors, like vs code - but... This isn't just a case of pre-existing software with a similar name - combined with ssh, gnu screen is arguably superior for pair bugfixing in production, for example (multiple ppl can ssh into the same server).
I get that this is "like gnu screen, but for xorg/Wayland - and without any support for resuming remote sessions" - just sounds like an odd pitch - as you say you especially want to target Linux support...