Both KDE and Gnome have significantly more developers on hand to contribute toward implementing their own wayland compositors, and on recent versions, their wayland implementations have worked very well for me, even on Nvidia hardware, which I couldn’t say just a few years ago.

In comparison; Cinnamon’s Wayland backend is only just now becoming usable for most average tasks, Xfce’s effort is the focus of this post, which has only just gotten to an alpha state (still not ready at all for an average user or for distros to adopt as the default), and MATE has no developers on the project who have the necessary skills to make a Wayland compositor, so they are instead trying to integrate the Wayfire Wayland Window Manager instead.