The core wayland protocol have so many missing piece and many extension are not standardized nor well defined. This is basically killing the interoperability between UI toolkit for non-trivial cases.
Well.... yeah? GNOME doesn't care about interoperability; they're the ones known for ex. suggesting that applications remove features for other desktops because GNOME doesn't use them ( https://trac.transmissionbt.com/ticket/3685#no1 ).
