Honestly I'm not gonna miss X Windows. I currently main a tablet with just 4 GiB of RAM (even though it's a machine from before RAM prices went up, heh) with an equivalent of Compiz (wayfire) running at full framerate, with really smooth multitasking for both FDO- and Android-based apps. In my experience, this simply would've not been possible with all of the bloat needed to support X Windows (not even with a bare-bones WM like IceWM [oh nostalgia]), but fortunately, I don't even need Xwayland installed, as basically all big and small apps run natively on Wayland now.