gtk3, gtk4 (probably?) qt, qt in flatpak, gtk3 in flatpak, gtk4 in flatpak (probably)... I'm just not fighting it anymore
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No, that's Gnome, not Wayland. KDE still prefers SSD on Wayland.
Wayland does force clients to be able to cope with a compositor that doesn't do SSD - CSD support is mandatory, SSD optional.
Interesting, I didn't know that but it seems like Wayland is indeed CSD by default. However, all relevant compositors except for Mutter support xdg-decoration (https://wayland.app/protocols/xdg-decoration-unstable-v1). So in practice it's still only a Gnome issue.