I agree with the point taniq makes in that those easier systems did in fact require a lot of hand crafting, even if parts were automated. I find it interesting the points at which the usefulness of these approaches plateaus.
I am interested a lot in general game playing, and there is a common problem that while the general systems tend to make interesting progress, it is the systems finely crafted to the game that win competitions.
What I am really, REALLY interested in is what commercial application exist for these types of technologies. Solving a puzzle slightly better than a different tool is fun, but solving a valuable business problem is where the money is at.