> They're literally fully capable of handling the flight from start to finish.

I find this to be a bit of a rosy take on things.

Autopilots don't take off (which is why Airbus' ATTOL project was a notable thing when an A350 took off "autonomously" [1]). They don't handle ATC (with the tenuously arguable exception of things like Garmin's Autoland), or handle TCAS on what I'd say is a majority of airliners.

Autopilot on planes is still quite "dumb".

1- https://www.airbus.com/en/newsroom/press-releases/2020-01-ai...