Obviously someone does.
I wonder whether this is because flat design does away with all the helpful instinctive visual cues that were developed over the last decades (e.g. shadows, faux-3d borders etc) and needs to find new colours because there's no other way of expressing relationships?
Is it the case that designers have been forced to come up with 'more' colours under duress because of this, and have to try out new colours? Or is it that people genuinely like them? Or does 'like' not come into it? Or is there just one very influential designer at e.g. Google who has a different aesthetic to me?
EDIT: I'm commenting on the colours on the page linked to this discussion. Not colours in general.