I'm not too concerned with balance - I think it's good to have some city-states which are very good and others which are situational. That being said, I do want all the suzerain bonuses to be useful. For instance, Halin's bonus (+2 science to writings) would be useful for civs who've focused more on Theaters than Campuses, but is the bonus good enough to be worth going for? Beikthano's bonus (cities gain ranged combat and defense strength) is useful early in the game if you're getting invaded a lot, or could make it more difficult to take AI cities, but does it make a significant enough impact? I'm pretty happy with Maingmaw (rivers provide bonus yields to adjacent tiles) and Sri Ksetra (Holy Sites provide food = to adjacency bonus).

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