After poking around with KDE after the Qt 5.15.2 update, I've noticed that a lot of packages around it are either completely broken or are full of deprecation warnings. Further research also revealed that KDE versions are tightly linked with the Qt version they're built against, so the best we can do is to update the entirety of KDE to match the Qt update. Otherwise we'd have to painstakingly hunt down all broken packages and patch them one by one, which isn't ideal and is a lot of unnecessary effort. In my opinion, this is important and must be addressed before the next kit regen, otherwise KDE users would be pretty upset...