Exactly. The key thing a lot of people conveniently ignore is how much infrastructure is needed per capita. Sure there’ll be more pipes/roads/etc. per sq km in a city vs the suburbs, but there’s a heck of a lot more pipes/roads/etc. per capita in the suburbs. I mean, just looking out my window, 100m of street serves hundreds of people, compared to maybe 100m of street for maybe 8 households in suburbia?
Given that there are 8 billion people on this planet, it simply consumes fewer resources to not have everyone in sprawling suburbia.