The issue is, these solutions are frequently retrofits of a local-first graphical environment: whatever you think about the actual X protocol, I think a display-server model that can be distributed across a corporate network in arbitary ways would make an amazing difference: You want to show something to a coworker? Send them a "window invitation" and, when they accept, an arbitrary window is mirrored to their display. Pairing? Everyone has a common "virtual desktop", and you just have two people's desktops temporarily merge. Instead we have nonsense like Wayland that is retreating from the mantra that "the network is the computer" (Amazon WorkSpaces is particularly disappointing here: there is no way, afaict, to have two screens logged into the same desktop: something that's trivial with tmux+ssh. My ideal is "tmux, but for GUIs")