Pretty interesting approach to make an X server that is essentially "Wayland-like" (merging display server/compositor by default, isolated apps by default, no remoting of GLX, dropping legacy protocol features to the point of breaking compat with the core protocol, etc.). Not sure who this is for, but by itself it looks like a fairly reasonable set of choices.
> by itself it looks like a fairly reasonable set of choices.
I have not tried this myself, so I can not speak from experience, but if they have removed features that people used, then they are in a similar situation as wayland. So I don't see what the difference then would be. Perhaps your analysis was also incomplete?
A lot of people would have preferred this to Wayland if it had come much earlier.
If it also runs Wayland apps, many may prefer it actually.
For people who absolutely have to have X11 this looks like a better plan than XLibre.