3 atb has become insanely popular recently. Chelsea and Inter's recent success, and even this tournament have shown a paradigm shift away from 4 atb.
It's really hard to break down when done well. I've never seen this City side look more toothless than when up against a good 352/532. Seeing Aguero or Jesus toil completely pointlessly against 3 CBs, seeing the half spaces get closed down and wingbacks block our wingers getting around.
It's a horrible thing to watch.