How is that any different from what you can do with Steamlink, Meta Quest Link, Bigscreen, Virtual Desktop or (sort of) ALVR?

Don’t use Meta products if you have any self respect

LOL

I wanted this for office work for like 15 years now, some good contenders popped up, but nothing truly usable.

It needs to be made for extended use, support good tiling (and not just have “screens” like shown here) or just Linux.