>[xdg-shell] is implemented by literally who? Uh... everyone. Mutter, Kwin, qwayland, wlroots, wlc, Sway, waymonad, Way Cooler, Weston, Enlightenment, and Mir

>[xdg-shell] is implemented by literally who? Uh... everyone. Mutter, Kwin, qwayland, wlroots, wlc, Sway, waymonad, Way Cooler, Weston, Enlightenment, and Mir all support it, as well as clients like GTK+, Qt, GLFW, SDL, EFL... Look, you don't have to use Wayland. No one has said it's done, and Xorg still works fine. If it doesn't support everything you need, then it's not for you, no big deal.