I wouldn't describe any OS as 'flawless', they're all doing what I describe under the hood. QT does have better support than GTK atm. I've also seen bad behavior on windows, esp with older apps. OS X is about the best out there, but even it can have issues with applications that have a view port (i.e. video editors, etc).

I'd prefer to skip all that so I'm happy staying on 1440p until 8k monitors are where 1440p monitors are today with regard to price and quality.