Traditionally, metro areas would have not just one, but many industries (e.g., NYC with banking, fashion, journalism, law, or Tokyo which is the capital of most

Traditionally, metro areas would have not just one, but many industries (e.g., NYC with banking, fashion, journalism, law, or Tokyo which is the capital of most of Japan's industries, and the national capital too), but they would also allow housing to be built, and that did indeed avoid the kinds of housing crisis we're seeing in cities today that are practicing exclusionary zoning.