Comment by prmoustache

I think it is the same for any domain. Only a tiny amount of things from the past are preserved. The egyptian or mesoamerican pyramids would have probably been all demolished if it wasn't a costly task and/or space would have been a limited. We only conserved a small fraction of arts from previous centuries, most of the tools/weapons/machinery that remains from past centuries was mostly kept out of sheer luck because some people are hoarders and their descendency were lazy and recycling wasn't a thing, etc.