nightline:
Your a lot behind there it’s the same principle on planes the pilot is only there for take off and landing the computer looks after everything else
Also auto pilot can land but not take off
Actually it doesn’t do either without two people supervising it! 
The only person to have been eliminated from the cockpit is the engineer who used to perform calculations and make auxiliary measurements. Much like the fireman has been eliminated from the footplate of the train.
The irreducible part is always human supervision to ensure that the machine is doing what it’s supposed to do in an uncontrolled environment.
The only time when machines are left loosely unsupervised is when humans have controlled the environment sufficiently that only the controlled environment itself needs to be supervised (like a factory gate).