[Gibbon1]

Having lived in the Bay Area for 50 years. I keep coming back to the observation that the 'just build more houses' crowd studiously ignores or is actively hostile to the need to build more transportation and other public infrastructure. And are loath to raise taxes fund more services. Developers in particular are utterly hostile.

Given that makes sense that home owners and local governments wouldn't be very keen on increasing density. There is basically nothing in it for them and a lot of negatives.