Not sure... for some types of apps they might "compete" but for many not, I think: I view (after some toying with Flutter) the GPU UI renderers ala Flutter, QT/QML, gioUI, slint.dev etc as modern Flash-like options in a "can do anything graphically you could do with HTML+CSS+JS, which isn't the prime choice for some devs or some apps or those that don't want to have to end up with Ionic/Electron" manner — whereas KMM likely (my vague assumption) abstracts the common native GUI components shared ...