Oh! then you've lived well through all these design fads of the last decades. Let me assure you, a bad designer is going to do a bad job whether you give them a desktop-first framework or not, that's the kind of desktop interfaces you might be thinking of. But a mobile-first framework will always render poor results on desktop, regardless (and in spite) of the skill and knowledge of the designer.

I cannot say this based on evidence, but I'll say anyways based on subjective common sense, that the Start Menu of Windows 95, 98, XP, and 7 were all immensely better than the Start ..."screen" thing of Windows 8.