Same. Given that no Wayland compositors implement it, or anything like it, and from some of my surface level reading about how compositors work, I get the impression Wayland is particularly ill-suited for this feature. I don't understand enough to understand exactly why, or why a new Wayland "protocol" would be required, though that seemed to be the answer. I hate not having this feature, it makes me feel trapped in an entire desktop paradigm I don't desire to be locked into.