I don’t know if there is a technical term for it but it can be said as we advance in knowledge we as a species lose knowledge as well. We would not be able to easily build the pyramids again - we can build a sky scrapper of a tower using steel beams but can’t really do the stone masonry on the pyramid scale well any longer.
Flint tools are inferior to metal in some ways but they are also superior in others - they hold their edge forever and don’t decay like metal does. As we learned to work with metal we lost the ability to flint nap, etc.
I read an article a few years ago that the knowledge to maintain or rebuild some missiles is lost because the people who made them and maintained them retired and died and did not impart that knowledge to a new generation so making a space manned vehicle would mean having to re-learn things known in the 60s and 70s.
Yeah, but they were able to figure it out in the first place in just a few years.
Besides, today's materials were not around back then.
I read a couple of weeks ago where Elon Musk's company is manufacturing rocket engines using 3-D printing. All the other big booster companies are jumping on the same bandwagon. ATK, ULA, etc.