Almost every server is plagued by incredible amount of buildings. That would be fine if we a) had severs and game engine that can take it b) in pve-c we had a way to deal with that.
I suggest a simple solution that could also provide a challenge for people. I think that buildings should be limited around some sort of totem, each clan/ person has 1-2 totems max that allow you to claim land and place buildings. That way you have to be careful to choose your location and you wont overload the server.
Also it could create new things to do in PvE-C as the buildings in the totem area could still be considered “immortal objects” however outside you would still be allowed to build but the buildings would be 24/7 destructible, thus giving people option to still bomb someone from time to time but not grief their pretty main bases. People would essentialy build a main base around their totem and then some PvP castles for fun. How does that sound?