Comment by johnnyanmac

There's loads of funding. But the ones funding Qt and GTK aren't parties interested in things like cohesion or design standards. They just needed a way to deliver their product to the user in a faster way than maintaining 2-3 OS platform apps. Wanting that shipping velocity by its nature sacrifices the above elements.

The remnants of the dotcom era for web definitely helped shape it in a more design contentious way, in comparison. Those standards are created and pushed a few layers above that in which cross platform UI's work in.