Cars work well for smaller, more spread out towns. They can’t really stop anywhere in most large cities - there’s just no parking for them. The space is simply too valuable to waste on parking other than loading zones and taxi stands.

There’s just too many people wanting to move about to accommodate them with cars. At these scales mass transit is more convenient.

Even my city relies on public transit, and it’s only around 200k people, 400k in the metropolitan area.