Well, a few things: The devs we know of mostly play on prince/king. They aren’t MP meta gamers. Balancing civilizations against each other isn’t the only concern. There’s a lot of other content in the game that things have to be balanced with, like how fast players get through the tree, systems like housing and trade routes, etc. Moving the overall power level of all civs can mess up that balance with everything else and interfere with the original intended gameplay. That doesn’t mean things cannot change, but its something devs need to watch out for over the long term.