Don’t forget the tradeoff with all the emerging automatic breaking in cars. If your car is braking “faster than a human” can react or brake, that has cascading effects to every car behind you, which may or may not have the same features. Following distance at highway speed just became way more important.
Whether it’s you breaking or the car doesn’t matter. The person behind you sees break lights and reacts.
If it’s the car reacting before you, less braking will be required and the likelihood of rapid deceleration due to hitting the car in front of you decreases.
Both of those things give the person behind you more time.
General rule of thumb I use is try to maintain a following distance that provides enough time to stop if the car in front of me magically stopped dead in its tracks. A car could lose a tire, brake suddenly, roll on its side or many other incidents regardless of emergency automated braking.
