Why don't we let the AI build more "cities"? Would distributing structures like houses in different locations instead of concentrating them in one place reduce the risk of complete destruction? I think so. In many matches with more than two players, there were times when I was on peace with all sides, and when one player was about to wipe out the others, I knew next target would be me. I sent my siege troops to where most of their structures were concentrated. When the declaration of war was made, my troops had already destroyed the enemy's structures, and they didn't have time to rebuild due to cavalry raids. This is just my personal experience. I think some people don't like the idea of AI building so much structures, and I'd like to know everyone's thoughts on this.
Yes, it's a work in progress created and maintained by @Stan`. It's happened to me a few times too. The good thing is that it's a great way to preserve replays and also to consolidate statistics and interesting game data. I imagine it can be improved over time.