The problem with Tesla's "Autopilot" is that it's marketed heavily as just that: autopilot. It's good enough to work that way 99% of the time, too, which is a recipe for disaster: things that work 99% of the time but have the potential to fail catastrophically often get glossed over by humans because it's hard to keep paying attention to something that rarely fails.
I'm not a pilot, but I have had flying lessons. Airplane autopilots are extremely simple. They can basically fly you in a straight line, at a fixed altitude. Tesla's autopilot is actually way more advanced than those found in airplanes.
Also, if the pilots input a heading change, the plane will execute a 1G turn using all control surfaces so it's almost imperceptible to the passengers.
I think you're oversimplifying airliner autopilot.. by a lot.