Districts time to build

The "tall only" effect was almost entirely the "must have building in every city"

Yes, this requirement was a problem and wouldn't work in Civ6 at all. But increasing cost with the number of cities itself is a good idea. Player may want to pause expansion until some great National Wonder is built and that's really interesting strategic choice.
 
The build time isn't different per tile or terrain. It's like a building, there is simply a set cost.
 
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