Airplane autopilot isn't designed to be used in the way you described. Should aviation rename that as well?

Pilots know that, but I bet a sizable portion of the passengers don't.

Can't you go theoretically go to the toilet on autopilot? It won't land for you, but while turned on it will keep the plane aloft until fuel runs out, no?

I don't know the answer to this, but it's my guess that at least the pilot or copilot must be at the controls at all times.

should be, but doesn't actually have to I guess. (still relatively empty up there, so not so much traffic to avoid)