>A huge fraction of kids who grow up in the projects do not do fine
I don't think anyone would debate this, however, I doubt success was ever really limited by the amount of living space they had growing up. Having lived in the "bad part" of a "rough city", square footage had no bearing on future success.
Square footage may or may not play a part in outcomes, but it's less debatable that "substandard housing" does. It's entirely possible that micro-apartments are a fine addition to the housing market. But that doesn't mean the entire idea of regulating housing is bankrupt.
I don't think anyone would debate this, however, I doubt success was ever really limited by the amount of living space they had growing up. Having lived in the "bad part" of a "rough city", square footage had no bearing on future success.