Why not? Because humans are bad at babysitting computers and get bored while the system is working properly. If there's an emergency then a distracted human wil

Why not? Because humans are bad at babysitting computers and get bored while the system is working properly. If there's an emergency then a distracted human will have a long reaction time. It's the opposite of a safety system like ABS that monitors brakes and wheels at all times and kicks in immediately if a human does something stupid.