The downvoters are thrashing a straw man. Obviously nobody believes you're supposed to recreate society every 20 years ex nihilo. What I'm arguing is that the case for reading history has been overstated. Specifically, I was reacting to the claim that, "Human behavior seems to be notoriously consistent across centuries." I agree. It is. Human beings react to the same emotions and incentives they always have and there's no library big enough to change that.
This is like arguing about whether dieting "works." On the one hand, obviously, yes, it works. There's no credible debate about the efficacy of calorie restriction for losing weight. It simply works. On the other hand, most human beings can't actually follow a diet, so, no, it doesn't actually work, for any reasonable definition of "works."
Reading history is probably a lot like that.