The part about the ancestral environment is generally accepted wisdom
I was nitpicking your wording. The habits developed in response to the ancestral environment, certainly, but saying that the brain made the "right" choices then implies a degree of order and sense I'm not prepared to atttribute to human brain-body coordination in any age.
Similarly, my objection was to being told that I experienced that state of creativity at that time. I don't doubt that it happens to some people.
Enough of what gets posted in the discussion section is looking for critique that I generally assume that suggested changes are welcome; I apologize if that wasn't one of your goals with this one.
We operate like this: the "overseer process" tells the brain, using blunt instruments like chemicals, that we need to find something to eat, somewhere to sleep or someone to mate with. Then the brain follows orders. Unfortunately the orders we receive from the "overseer" are often wrong, even though they were right in the ancestral environment. It seems the easiest way to improve humans isn't to augment their brains - it's to send them better orders, e.g. using drugs. Here's a list of fantasy brain-affecting drugs that I would find useful, even though they don't seem to do anything complicated except affecting "overseer" chemistry:
1) A drug against unrequited love, aka "infatuation" or 'limerence".
2) A drug that makes you become restless and want to exercise.
3) A drug that puts you in the state of random creativity that you normally experience just before falling asleep.
4) A drug that puts you in the optimal PUA "state".
5) A drug that boosts your feeling of curiosity. Must be great for doing math or science.
Anything else?