Screen capture is a recently solved problem on wayland. Yes, existing screen capture software that doesn't implement a new backend is broken, because the X mode

Screen capture is a recently solved problem on wayland. Yes, existing screen capture software that doesn't implement a new backend is broken, because the X model of screen capture was fundamentally broken, and one of main goals of Wayland to fix. But Firefox and OBS can do screen capture on wayland just fine, regardless of compositor. The gnome global menu thing is a problem with gnome's implementation of wayland. The functionality could surely work if Gnome decided to support the same standard as wlroots does for allowing custom panels like waybar. Perhaps the complaint is that wayland give the gnome despots too much power, but if you don't like gnome, then complain about gnome, not wayland. I don't know enough about KDE or AppImage to comment on those complaints.