Fatbergs and brownouts point to underinvestment in utilities (budget problems / many historic, undemolishable buildings)

You need to keep less $ invested in infrastructure per person if everyone lives on top of one another in a condo.

If everyone lives in a white picket fence SFH then you have to build miles of extra roads, pipes, cables. Every trip for every bus, truck, and car is a bit further.

There's a lot to be said for both rural and city life but cities can be much cheaper if there's unrestrained development.