Consider that for many GTK is also native. Mate/Gnome has been a standard for many years. Personally I'm getting more problems with Qt apps than GTK. Especially: font rendering, once a year or so Qt apps revert to outline fonts (I use bitmap OTB fonts as desktop font - i like pixel perfect quality in small sizes) or worse stop rendering font at all and I get empy menus. Second thing is IME support this also breaks very often on updates. Why Qt neglects such basic things I don't know, but because of the above I cannot call Qt 'excellent'