GNOME and KDE definitely are the outliers, but they are the biggest players and they didn't do this out of sheer evil or whatever. They did this because when ev

GNOME and KDE definitely are the outliers, but they are the biggest players and they didn't do this out of sheer evil or whatever. They did this because when everyone was pushing for Wayland adoption, wlroots didn't exist or wasn't usable. And when it came out, everyone called it a "reference implementation" and it was expected of DEs to implement their own compositors. And the main problem wasn't even that DEs didn't have a shared codebase for compositors, it was that there weren't any standards for critical features of any modern system. It was all "up to the compositors", meaning it wasn't just a matter of implementing some APIs, they had to be designed first. We now have different protocol extensions for KDE and wlroots alongside external DBus-based APIs for GNOME that have now also been partially implemented by KDE, yet there are still basic X11 features that can't be done on all of these compositors.