Why did so much technology that was common in the Roman Empire did not make it into the medieval age?

Question

Examples like aquaducts, sewage, advanced architecture, etcetera

In: 121

Answer 1

Part of it was the Romans could utilize their armies to build roads, aquaducts, etc. Part of it was that large cities collapsed. Part of it was the motivation of the elites changed ($ went to building cathedrals instead of theaters for instance). Other comments address other factors.