For any accidents I can think of where this modification would cause an accident, the driver would have to sit back and let the autopilot do the driving: that's

For any accidents I can think of where this modification would cause an accident, the driver would have to sit back and let the autopilot do the driving: that's irresponsible in any car. Is there something else, like severing a drive-by-wire connection to the brakes, that I'm missing?