So this in effect makes XWayland just another Wayland client, rather than what it used to be - the usual Xorg running in a very careful way not to step over Way

So this in effect makes XWayland just another Wayland client, rather than what it used to be - the usual Xorg running in a very careful way not to step over Wayland and drawing on Wayland surfaces? And now nvidia are complaining that unless XWayland can have direct hardware access, they don't really have a path planned to supporting OpenGL and the like on XWayland, presumably due to them not supporting Wayland? Perhaps their time would have been better spent finding ways to support Wayland proper and not coming up with proprietary workarounds that will stop being feasible the moment someone makes a small change.