Growth comes at a cost, especially when that growth was not in the original plans.
Think of it as an old city versus a new one. In fast-growing parts of the country, builders have created something called a “master-planned community,” that is, a town or city that is completely planned. This means that before builders put down a single house or build the first shopping center, they build (or at least plan) the infrastructure needed for the community when it is fully built.
You can’t just go back to widen roads or increase the capacity of the sewage treatment plant. It’s much more cost-effective to plan for what could take decades than to build as you go along (which is roughly how every major U.S. city is built and explains why those cities have expensive problems ranging from housing to transportation, and good water).