that’s just the thing, This is again, more fragmentation, Some compositors support always on top, some don’t, you choose x protocol for your app, and now your app works great on sway, but not on KDE or gnome, or it works great on gnome and not kde or sway etc. As an app developer the situation is a bloody joke. My current stance is “just use xwayland because wayland will never be suitable” and thankfully with cosmic and kde both supporting “don’t scale xwayland” this seems to work well.
EDIT: they also make enough deviances from the upstream protocols that this can’t really be considered a “experimental branch”
EX: https://github.com/misyltoad/frog-protocols/blob/main/frog-protocols/frog-color-management-v1.xml vs https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/14/diffs
this is pretty much how it works in some cases, you need to port from one protocol to another, or to a different system altogether.