With uses segregated, the "reasonable" argument does not make sense to me: infrastructure will have to be maximized because there will be big migrations of people based on normal use times like going to work. You need twice as much parking, twice as much freeway throughput.

Don’t just think in terms of low density around current American cities.

Plopping down a subdivisions in a sleepy county can quickly overwhelm local school systems, sewage treatment, etc. Even just 7% annual growth doubles the local population every decade which requires incredible and increasing investments in infrastructure. Slowing that down slightly is hardly unreasonable and it can help avoid expensive and damaging boom / bust cycles.