the kind that introduces regressions?

there is a reason lead developer of X11Libre left Xorg project, they did not like broken code: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1760 (and many more if you search)

That’s a fork, which is fine. But for example, users from most mainstream distros will have to compile it themselves.

I guess we’ll see if that development is ever applied to the main branch, or if it supplants the main X branch. At the moment, though… if that’s the future of X, then it is fair to be a little bit unsure if it is going to stick, right?