Also for Kirigami to be on the “top” it also needs to have proper documentation for Cross platform. As seen on another recent thread:
https://discuss.kde.org/t/kirigami2-for-developement-on-windows-rant/6333/6
Cross platform support is something missing from GTK apps QML/QT is already in a much better position in that regard as QML can “work” on Windows. This is important because not everyone creating apps wants to make apps just for KDE. If Kirigami wants to be used as an alternative for developers who have no idea about KDE ecosystem it needs to have all these support to make their life easier.