I don't have FSD, but are you really saying that it differs in a significant way from basic AP in its basic ability to control the car? Watching my car bounce around the lane of a typical UK single carriageway A road is almost comical - it goes too deep into corners; sometimes get uncomfortably close to oncoming traffic; fails to adequately slow down for some bends; gets dangerously close to clipping the kerb at times; fails to recognise parked vehicles reliably; brakes at random and unnecessary times; brakes too late coming up to stopped traffic; blasts through speed limit changes; and overall just has that general feeling that the whole thing is trying to kill me!...and we all know that, as of now, the standard car (i.e. without FSD) isn't really capable of full self driving.
From what I've read here and elsewhere, these are all "features" of FSD too. Am I mistaken?