I think the intractable evaluation problem is salient for many other fields as well. A machinist might know a particular design can't be built, but may not be a

I think the intractable evaluation problem is salient for many other fields as well. A machinist might know a particular design can't be built, but may not be able to quantify why. I think it's certainly possible that the universe ends before sufficiently complex problems can be processed by a GA or even adequately defined. On the other hand, displayed UI could probably be tackled by GAs even if the evaluation function is never codified. Stick a couple hundred no skill workers in front of a screen and you could get a couple hundred thousand evaluations an hour; in effect industrializing design.