Wayland xdg-shell Protocol is tailored only for GNOME needs.
What why is this a problem at all? For what’s worth GNOME is the only actually half designed and half usable thing out there. Yes they could add desktop icons and drop the “go into activities after boot” bullshit but how well, they’ve 1M€ in funding to reinvent the DE in all the unnecessary ways possible.
(And this comment is how you offend both the GNOME fans and haters at the same time. Probably also anyone else who cares about having alternatives.)