It's about clarity, affordance, organization, and not getting lost. And also, yes, consistency as you say -- this has become more consistent with iOS settings, which is a good thing.

(I also don't know what "click/twitch" means. Googling it gives me zero results that aren't for Twitch streaming. But in any case, the navigate/back paradigm has nothing whatsoever to do with which input device you use. Neither mice, trackpads, nor touchscreens have any kind of consistent "back button". Sometimes there's some side button or side swipe that works with some programs, sometimes there isn't.)