[digitalPhonix]

> Autopilots in airplanes are kind of dumb (keep heading, speed, and altitude, they won’t do much anything else)

That is absolutely false.

A 20 year old avionics suite in General Aviation (GTN 450) does much more than maintain altitude, speed & heading - you input a flight plan including an approach, it will fly the flight plan, capture the approach signals (VOR/localiser/whatever - which is far more complex than “keeping course”) all the way down to approach minimums.

It can go down to 200ft for an LPV approach.