While I agree with most replies here that the initial post had some bad information, I have noticed that autopilot does slow more abruptly than I would in the same situations (and I don’t mean when it slams on the brakes for no reason). I believe it’s because it’s always trying to maintain an absolute minimum distance from the car in front while a human driver would allow for a more elastic follow distance. It’s noticeably awkward from my perspective as driver driver, and I would guess the vehicles following me would also find it unusual.