GNOME Devs' (that are also GTK devs) Motivation for Cross-platform GTK4 Apps?

As a GTK developer the answer is quite simple: There is no developer maintaining portability. To have a portable toolkit, you need at least one...

reddit
@retr0id Qt is pretty much the only free native toolkit that works well across platforms, but you're getting Mostly-Qt-With-A-Little-Native-Sprinkle styling. It's less than ideal...