Single-speed... I just don't get it

I'm gonna be charitable, I bet lots if not most of the freewheelers with one brake aren't trying to pretend it's fixed, just that they've seen lots of people with drivetrains that look like theirs with just one, they don't know why but it's obviously the done thing.

pretty much, thought I used to ride singlespeed with one brake, mostly because I never used the rear one at all, so end up ditching the rear one just to save a bit of weight and keep thing simple.