Quite. Yes, John Deere did create self-driving tractors designed to follow strictly specified paths on vast open fields having controlled access (i.e.: other ve

Quite. Yes, John Deere did create self-driving tractors designed to follow strictly specified paths on vast open fields having controlled access (i.e.: other vehicles & people could be denied entry to the area &/| informed of the situation) and well-defined path markers; this is a necessary but not sufficient precursor to developing a vehicle for use on arbitrary universal-access roads. Likewise, I was using tablet computers created by Wang back in the 1980s, ungainly monsters 3" thick with low-res monochrome screens and short battery life; this was a necessary but not sufficient precursor to the iPad. "Necessary but not sufficient" meaning "yeah, they made something like X way back when but somebody else had to do a whole lot more work to make it the viable & popular product we know today."