Skills accumulate and mature over centuries, but get wiped out over a generation by bean counters and politicians!
. . . And often plain knowledge too :-(
Some swedish indland lake-fishers got a very old wooden box with rusty items in their net - and the archeologists went crazy: It showed to be a craftsmans toolbox from the first millenium-change.
In Scandinavia is amateur experimental archeology a widespread branch and when copying the hammers in the box they found that they had so much punch and precision :-o
My brother in law is carpenter and lets no chance of testing hammers he come past get spilled, hence he knows that it's not obvious that modern hammers do have punch and precision as his hands experience it and the one wich do never must be unattended!
The viking carpenter had probably had his words with the blacksmith about the tools, where my inlaw must chose between houndreds of seria-produced 'items'. Development?