McMansions are for workers. That's how they got their name. Big like mansions, but built as cheap as possible so that they're (relatively) affordable.... Until they start falling apart in 15 years.
Yes, car centric suburbs have tons of problems but when has that ever stopped us? We build them in literal flood plains, and along cramped mudslide prone mountains. I’ve never heard of an empty piece of land in the middle of nowhere being zoned for high density residential in the US.