Eh, I'm going to disagree with you there. Qt on OS X still produces dramatically non-standard looking UIs.
I don't think papering over the significant differences in UI paradigms between Windows and OS X is something that is fundamentally solvable by a widget toolkit. You can make a toolbar full of buttons work on both platforms, but you can't solve the fact that cramming 40 buttons onto a toolbar feels completely non-native under OS X.
I don't think papering over the significant differences in UI paradigms between Windows and OS X is something that is fundamentally solvable by a widget toolkit. You can make a toolbar full of buttons work on both platforms, but you can't solve the fact that cramming 40 buttons onto a toolbar feels completely non-native under OS X.