I agree that there are situations where what I do as a trained driver is different from augmented cruise.
A good example (or perhaps I'm wrong) is this: in a lane, car pulls into lane in front of me and between the car further ahead. Now I don't have enough space in between me and that new entrant. But instead of using brakes (unless eggregious), I bleed speed until I make space I want. Augmented cruise doesn't do that - it hits brakes.
So, from behind, I think it looks like I'm using my brakes a lot more than I am when on augmented cruise. And excessive brake use distracts the driver behind me.
I've got plenty of experience, and (feel as though) I know most of it's failure points. I had to drive my 30 minute commute last week, and it was decidedly unfun. I have seen the future and I don't want to go back.