well, cosmo says it must be the city. That's it. Me and the team im with are adding an endgame point. It is not necessary but just think about what you want your game to be and the audience you want to hit. Some people differ on the way they like open world games or city style games. If you want an endgame point then add one. If not, then don't. Make it however you want. Sorry, I know I am not cosmo but I am saying this by what I've read.