I agree. Would not be surprised if we unearth more ancient machines like https://en.wikipedia.org/wiki/Antikythera_mechanism. I'd bet money Egyptian engineers first developed sophisticated tools (since lost) before building the Pyramids, for example. I'd also bet money there existed thinkers thousands of years ago who invented superior maths to our current maths, and made tools using those maths, but their work wasn't distributed enough and was lost. The brains of top thinkers back then were just as capable as the top brains we have today, afaict.