In wlroots they probably won't implement it because that requires a GUI toolkit and they don't want to depend on any particular toolkit. The push behind waylan

In wlroots they probably won't implement it because that requires a GUI toolkit and they don't want to depend on any particular toolkit. The push behind wayland happened specifically because the desktop environments wanted to implement their own display server, and it was becoming problematic to try to make it happen transparently. It's actually somewhat of the reverse of what you're saying, desktop environments can only wash their hands of things and push them off to the X server for so long before it becomes untenable.