> if we really needed to made pyramids in the same way, we'd figure it out.

We've been trying to figure it out for a century and still haven't. Why do you think we could now?

Same with the engines. We've been trying to make an F-1 for over a decade. In 2013 they even tore one down to figure out how it was made [0]. They still haven't figured it out.

[0] https://www.extremetech.com/extreme/146829-nasa-resurrects-i...