Why is OpenSuSE not Linux? In general it is less buggy than Ubuntu. Ubuntu is the mother of all buggy distros. I'm not looking for an argument because I have too much proof to be able to lose my argument. OpenSuSE has one of the best KDE4 implementations there is (perhaps second only to KDEmod in Arch Linux) so the poor KDE integration is not their fault; they have done everything possible on thier end. Google was silly to use GTK, I really can't think of any reason why they used GTK besides "Ubuntu uses Gnome".
incompatibility with KDE is kinda a good thing.
1995 called and left a message: "KDE is now free software". Funnily enough KDE is not much less popular than Gnome which I suspect is largely to do with Ubuntu's popularity. I don't know what would inspire you to suggest that not having compatibility is a good thing. Maybe you should consider a career with Microsoft.
Full Disclosure: I am a Fedora fan, not an OpenSuSE fan.