I'm tired of seeing my friends building hundred of cities, even at the worst locations, just to have more cities. Since there are nearly no disadvantages having hundred of cities, it is always good for them to build a new city. In Civ 5 we had at least national wonders (you need building x in every city to build it) or the culture cost increase for politics. But it seems Civ 6 is lacking such a mechanic. What ideas do you have, to make few big cities able to compete with many small cities?