> Shenzhen grew from 100,000 people in the 1980s to 13M now with no housing affordability crisis...by building.

I wouldn't use China as an example of solving the housing problem by simply building. There's currently a large oversupply problem [0] and, not entirely unlike the US (but more extreme), excess supply of housing has lead to people simply owning more than one property as an investment strategy.

0. https://www.wsj.com/articles/chinas-smaller-cities-struggle-...