I have a hard time accepting the mechanics that allow the player to set a district before enter a new era and then switch to another build, locking the district cost so it doesn't go up, when entering the new era. First of all, I'm forgetful. Yes, that's on my side when playing a civ game. That will always punish you in this game but I feel this is punishing you for something that isn't a logic setup and more of an game exploit that intended gameplay. And the punishment (extra hammer costs) is quite severe. Does anyone know if the AI is using this tactics? (meaning it's a viable game mechanics).. If not this should be fixed so the AI can exploit this cost lock as well. Is it only me that thinks this system is weird? I'm not sure if this was intended as exploit on purpose but it feels like it isn't.