I am cautious about how much individuality Civic Centers will grant their districts. The earlier independent city variants made it clear that multiple cities were awkward. Reimplementing a system to make districts more awkward is counter productive. While, some differentiation might be good, but I fear that too much could lead us back to disaster. Plus at this juncture, if it works, it should be left to the polish stage so more immediate focus can be spent on larger issues (e.g., AI, mid-game, late-game, market items, win conditions, etc).