Still even though a few ancients were very far ahead of their time,<quoted text>
It is easy to underestimate the amount of knowledge of how things work we had through experience with, say, forges and waterwheels. The Antikythera device shows that the ancient Greeks knew how to make precision machines with gears, but such devices never became common. There was even simple knowledge of heat engines, but they were used for toys partly because the metallurgy of the time didn't allow seams tight enough for large scale use and high pressures. Knowledge doesn't progress linearly.
Leonardo, Archimedes etc. The way we are able to store and communicate knowledge makes the human knowledge factor no comparison. It was easy to lose and forget all great advances known in the destruction of a few places. Think of the stored information now. Home computers with 4 terabyte hd's is like a entire library of Alexandria in millions of places on the web.
Along with millions of websites, and millions of researchers with millions of schools and private corps. with information at the fingertips.