https://invent.kde.org/plasma/kwin/-/merge_requests/1751

I think supporting older Halium devices (like Nexus 5X) would make no sense. So, if Halium support was brought back, maybe it should be brought back for Halium 9 and upwards only? Also, that would make the kwin hwc backend less complicated as it would not need hwc version 1 anymore.