And the pyramids were built without benefit of the wheel?
https://duckduckgo.com/?q=jay+leno+restoration+blog
I don't know which episode it was but they manufactured replacement brass waterjackets for some engine. The craftsmanship to do it the original way is no longer available. Or at least economic. I know he mentioned 3D printing a Mercedes dash knob that would have cost $500 OEM.