I do find it interesting that by far and away, the greatest leaps in axe "technology" took place in America, at the time being land of immigrants and a convergence point for all sort of cultural anti-culture mentalities. The stifler who were happy with their grapes, milk, and flat faced axes were the ones who stayed in Europe. It was when the cultural veil of that "culmination of knowledge" was lifted that improvements were made, I think. That is not to say that that process is a useless one, I don't think it is. But it depends on individual and cultural rigidity. And individual progression of ideas and and eventually culmination is, I think, a more useful process than a cultural one, which lacks the adaptability and intelligence to really bring it to the point where something like this needs to be.
I think its mainly the culmination of knowledge in a 50 or 100 year span, with a very important omission in way of the time where nobody wrote about it prior to that span, because it would have been like writing about a tooth brush, or how to walk. You just did it at the time as a matter of course.