A disadvantage of using deferred rendering techniques, due to separating the lighting stage from the geometric stage, is that hardware anti-aliasing does not produce correct results any more. This is the main reason there isn't any AA in Mario Kart 8. Why Bayonetta 2 aint using it is prolly for the same reason.
Expect, at least Nintendo, to stick with the 720p/60fps/no AA standard going forward.