I have been wandering through hundreds and thousands of cities and villages in middlearth. I have been visiting the great pyramids of Harad and the mines of the dwarves, the pretty buildings of Dol Amroth and the strong fortresses of the Easterlings.
But yet, i've never seen even one house, temple, stable, watchtower or fortress being build.
What i'm going to suggest here is to bring more life into the towns and the whole world with structures that are not completely built.
tbh i don't even know how exactly this idea could be realized, so be free to share your ideas and thoughts on this.
EDIT: in contested or freshly occupied areas there could spawn ruined structures or villages of one faction, and building buildings (lol) of the other faction