It doesn't bother me too much, and I even get some of the "clean" aesthetic they're going for, but then, I've been habitually staring at screens for over a decade. I'm fairly certain I would prefer darker interfaces if and only if it could be consistent and colorful (dark colors are nice, but to me, 50% gray is somehow even more boring than white) (looking at a bunch of white is bad enough, but switching from a dark, comfortable page to a completely white one is a truly terrible experience)