They do for legal reasons. Are you saying autopilot is no better than adaptive cruise control and lane assist found on many cars - Not the impression they want you to have at https://www.tesla.com/autopilot ...

Sure. And I'm skeptical that's really enough to keep most humans alert enough to actually be effective at taking over at any time.

Most users will say it's fine, of course. And, as here, Tesla will certainly use it to quickly blame the driver in an accident. But I'd like to see objective measures of attention compared over the long term.

You can't ask a human to do that. It's like selling a gun with a trigger that pulls if you wave at it.

Didn't work for trains, now did it?