What? There are still a lot of tactics a driver (or AI) can follow to improve the outcome if the brakes fail, such as swerving to avoid dangerous things while t

What? There are still a lot of tactics a driver (or AI) can follow to improve the outcome if the brakes fail, such as swerving to avoid dangerous things while the vehicle naturally coasts to a stop, intentionally driving into a soft thing or up a hill if available (eg runaway truck ramp or a pile of haybales) or in the worst case, decide which of two bad things to run into is less bad. Not making a choice is a choice too, as in the trolley problem, it means you'll hit whatever is straight in front. So in that sense it's quite relevant. Great, you can usually just apply the brakes. What if you can't or don't have enough following distance? (less common for an AI driver that will try to leave enough distance, but that's not entirely in your own control; another driver can merge in front of you at any time they wish and if an incident occurs before you can increase the distance, you will effectively have to swerve since you won't have enough braking capacity. It is worthwhile to take a look at dashcam videos (eg, youtube, reddit) to get an idea of the many, many complex scenarios a driver can find themselves in in which a crash is imminent, but the driver has many options and must decide what strategy to take to get the least bad outcome.