[sprash]

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.

[akvadrako]

X11 can't do this because memory allocations happen in the X server.

[sprash]

DRI3 clients allocate themselves their render buffers. Hence perfectly possible with X11.