XWayland can be run in 'rootless' and 'rootful' modes.
Rootless is what it is typically ran as and allows you to integrate X11 apps into your Wayland desktop environment.
Rootful would allow you to run X11 desktop with X11 Window manager and the whole ten yards.
I don't know how well rootful mode is working because it is rarely used. I imagine it would take some work to make it fully functional. But it something that exists and I would expect that the Xorg/Wayland devs would like to see it fully fleshed out.
But that essentially gets you most of the way there.
Rootless is what it is typically ran as and allows you to integrate X11 apps into your Wayland desktop environment.
Rootful would allow you to run X11 desktop with X11 Window manager and the whole ten yards.
I don't know how well rootful mode is working because it is rarely used. I imagine it would take some work to make it fully functional. But it something that exists and I would expect that the Xorg/Wayland devs would like to see it fully fleshed out.
But that essentially gets you most of the way there.