That idea is of course laughable, but I didn't say anything of the sort. It's not the physicality, but the messiness, ambiguity and harsh consequences of the n

That idea is of course laughable, but I didn't say anything of the sort. It's not the physicality, but the messiness, ambiguity and harsh consequences of the natural environment. Current machines operate in environments that are deliberately designed to be highly structured with clear goals and where consequences of errors are highly mitigated. Machine learning has made some more messiness possible, but it still depends quite a bit on predefined structure.