About the automatic cars debate, I feel that the problem here is going to be people who apply the Bay12 motto of "any peaceful technology can be adapted into a much more amusing and violent one" to real life. Some people will just decide to buy an old car, strip out as much of the electronic stuff that can be used to trace them by the auto-drive stuff and then just go crazy. Hell, in that scenario even standing still would probably cause the automated car system to kill at least one person.
I agree with Tschusigumo. But why stop at being a mecha? All you really need for fast-switching, multiple-body processing is a central computer and some system to send signals (more reliably than just electromagnetic radiation-based versions, as you don't want someone to start broadcasting on a specific frequency and cause you to walk off a cliff by accident). That's basically the technological approach to the concept of a "soul".
Mostly, what humans can do better than robots is being absurd. We're a mess of several redundant systems left over from past usages and using several systems (both electronics and fluids), with no one having attempted a bug fix yet. To me, that means that what humans are better than robots is not science, but
mad science. No robot would do the sort of stuff as we humans have done with DF.
Evolution isn't exactly the same process as innovation. Evolution is like water, it always flows downwards, but that doesn't mean it always finds the lowest point. It won't flow up the side of a basin to reach the floor, and in the same way evolution will rarely follow a path that is less well adapted in the short term, but can branch into something more well adapted in the long term. It is for this reason that we are full of all these biological redundancies and poor design choices as a species. I imagine your food creation method would be much the same, you would get a very refined dish, and it would change over time to suit shifts in cultural taste, but you would rarely, if ever see the kind of brand new innovation that is so indicative of human design.
Also, superfluids do flow up the sides of basins to find the lowest point. But you're right about evolution, and that's exactly my point.