There's a notable time gap between the time when the autopilot should start braking at a reasonable rate, and the last possible time when a full-strength brake

There's a notable time gap between the time when the autopilot should start braking at a reasonable rate, and the last possible time when a full-strength brake will be sufficient. That time gap should be sufficient for an attention-paying human to apply the brakes. I am however, doubtful think it's really reasonable for humans to have this expectation of 100% attentiveness given an autopilot that 99.9% of the time doesn't crash into things .