I don't understand that comment. The K-suite of apps is just as comprehensive as the G-suite of apps - most people don't really care or notice anyway. No, I did not notice that Firefox uses GTK - seriously, who cares, and it is even shipped as a snap or flatpak. (I would even say that Qt is far more capable and developer friendly than GTK, so I'd pick Qt over GTK _any time_.)

There is one app that I installed recently, that used GTK and I noticed it - the ProtonVPN Connect UI, it looks a bit funny, but integrated seamlessly in the whole system (KDE) including the tray icon. It just works. What is the problem?