This is my gut feeling too. Every time one of these awful minimal flat interfaces pops up I know I'm going to spend ages trying to find where they've hidden all the functionality just to keep the UI 'clean'.
It's weirdly nostalgic, like playing the original "Wolfenstein 3D": there were effectively no visual cues for which wall panels were secret doorways so to find all of the goodies I ran along the edges of rooms pressing each panel in turn, endlessly hearing the flat farting tone that confirmed that yet another one did nothing useful.
Note to UI designers: nostalgia doesn't necessarily mean "good". I can be nostalgic for my grandmother's cabbage soup, doesn't mean I want a daily banquet of the stuff.
