It's based on wlroots, but Wayland is less supported than the X compatibility layer via Xwayland. That's fixable though.

Developing a VR desktop on top of X-Windows seems like driving very fast down a dead-end dirt road with a cliff at the end.

We don't actually use X as the framework. The underlying code is Wayland, and then Xwayland as a compatibility layer. It's just that most apps we test against are X11.

It's a Wayland based compositor (using Drew Devault's wlroots) that supports X apps.