Flight International, August 1934:
The relief which is afforded to the pilot by the
use of the Automatic Pilot permits him to devote the
greater part of his time to navigation, map reading, and
the operation of his radio installation, whereas with manual
control, his whole time is occupied with the actual flying
of the aircraft.
That was the original intent of Autopilot: offload the mechanics of flying so that the pilots could concentrate on finding their destination even at night or in bad weather: conditions in which the autopilot was also immensely superior to an infallible and easily-confused human, not the other way about as we see with systems such as Tesla's.
They didn't have to keep their hands on the controls, they could trust that the machine could handle everything except the one-in-one-million scenario.