Wayland sounds a bit like what Vulkan is to OpenGL? Am I anywhere close?
I'm a novice when it comes to the implementation of compositors and display servers, but as a user it's been a far better experience than X11/Xorg ever was. Seeing this robustness video just proves it to me even more.
Rather the opposite. Wayland is a far more opaque abstraction layer than X11.
Also the "robustness" is achieved with KDE/Qt specific protocols and as such has nothing to do with Wayland. Similar functionality could be achieved with X11.