I also wonder whether “dumber” systems are easier to predict. I’d feel much more comfortable knowing what the car won’t do (change lanes on me, e.g.).

(Update: to be clear, I’m not inherently opposed to a car changing lanes if I need it to, but it seems easier to deal with a potential emergency, and easier to persuade myself to pay more attention, if I know definitively it won’t do something that sophisticated.)

That's all Autopilot is--Tesla's branding for adaptive cruise and lane keeping. It's just as useful as competitor's versions.