CSs aren't edited or changed in terms of production/growth, though I can buff em a bit if there's demand.
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I think that would be a good idea. I also noticed that for some reason that city-states completely ignores monuments for some reason. (Even in industrial era, grabbing a city-state with merchant of venice, the city doesn't have a monument.).
Might be related to the fact that puppets usually ignore monuments as well, I have seen them working farming when they don't have monuments and stuff like that. Eventually the puppets get monuments however.