Not sure if its XWayland but the vision stutters a lot while everything else is smooth. Also X11 seems unusable for some reason on KDE because I get a lot of glitchy artifacts (and Direct Mode seems to be enabled)
Edit: Using an AMD 6750xt with i5-8600k on Arch Linux with KDE Wayland
You cant open games inside the Steam Main menu in VR (not sure if its a wayland or SteamVR thing), start the VR Games using your mouse and Desktop.
It was a craqued standalone non VR version.