> ... forgotten inventions ... lost technology ... the knowledge of making

I see people in this thread talking past each other and I think the reason why is because the author is conflating 3 very different topics (inventions, technology and knowledge).

E.g. we absolutely have forgotten the knowledge in how Egyptians built the pyramids.

That doesn't mean per se that Egyptians had better/worse technology - but from a knowledge of how they built the pyramids - that absolutely is lost.