Having lived in SF for 25 years I think trying to inject banal partisan politics into this results in garbage. Doubly so when you start saying that letting developers rip with no restrictions will fix everything. Which seems to be the HN tech bro opinion.
The city has close to 20,000 people per square mile, average. And has no greenfield left. You want to increase density? Well then make developers and tech companies pay for a subway. And another BART Tunnel. Like every other city with that sort of density.