Pilots have a better chance of saving the plane if something goes wrong, software is less good at dealing with edge cases than an experienced test pilot and in

Pilots have a better chance of saving the plane if something goes wrong, software is less good at dealing with edge cases than an experienced test pilot and in order to figure out what the edge cases are in order to programmatically deal with them, you need a human to find out what they even are and figure out how to fix them.