However
That "one job" is impossible, and made so by Uber.
Humans cannot maintain a high level of concentration for long periods when not actually doing anything.
On top of that, grabbing the steering and/or moving your foot onto the brake may not be physically possible within the available time.
Mostly-autonomous is probably the most dangerous stage and needs very careful human factors analysis, which Uber didn't do.
It also might have helped if Uber hadn't disabled the built-in driving aids.