It doesn't require a great deal of attention, either, and it's still mostly passive. Unless you're suggesting we should outlaw conversations or listening to the radio we're past the idea that people need their full undivided attention to drive. The question now is just what's the minimum.

I've seen people die in the ED because they treated driving as a passive activity. I find your hyperbole about outlawing conversations unhelpful. I very much look forward to computers having better driving skills than I had when I used to work in the ambulance service.