The Imperium must have a few new builds on the go, not everything is hundreds or thousands of years old

I would be good, though I would add that looking at our world much of it is a complete mess but a few areas are 'shinny'. I was thinking that uni you posted was more appropriate for the leadership or elite areas, where the vast bulk of the Imperium's citizens can only imagine living and look on from afar.
After all every city has an under class and slums somewhere. I think the Imperium probably puts them underground (out of sight - out off mind) like the homeless in the old subways. Tragic, but is allows those with thoughts of superiority to feel good about themselves and isn't that what is important to the Imperial nobles - to (illusion) of paradise?
Philip