too many software engineers in this thread sidetracked on whether FSD would have stopped or not.
the bottom line is that with only feet left between the car and the stop line, regardless if a human brakes or the car brakes, that is going to be very forceful deceleration, way more jarring than any phantom braking event. Let's say the car stopped in time. Are we really going to pat FSDb on the back for doing a good job? Would your passengers be marveling at the technical prowess of the self-driving system? And extrapolate this to a future robotaxi application. As you're napping, or working on your laptop, and suddenly there's a 1g deceleration event for a situation that could have been executed smoothly. How would you perceive that self-driving system?