[didibus]

> It seems like every decade we find out everything we did last decade was bad and wrong but now we've finally for sure got it figured out

I think you're being unfair. Most of the time, it's not a major 180, it tends to be smaller course corrections, refinements over current understanding of data, and the discovery of even more correlated complexities.

The issue is people want simple answers, easy to follow guidelines, and guaranteed results. The science just isn't at the point where it can deliver those. So people make up best guesses for them each decade based on where the science is at that point.