It seems like the State and YIMBY or whoever should push housing near transportation as well as denser housing. This is obviously not that.
If you read the GP's post, you'll notice they're complaining about not being able to build on an irregular parcel in Marin that's advertised for $12K. Of course, the parcel is that cheap because you can't build on it. The GP should save their complaints for problems that make sense. Complaints about not being able to build in Mountain View make sense, this doesn't.
Altogether, the problems of US housing comes from too much low density housing and too little high density. Given this, keeping people from building on marginal locations is not the worse sin, to say the least.
It does hit on the fundamental Bay Area issue that almost all water is imported, and there are significant restrictions on development because of that. Almost all of the land surrounding the populated bay is part of a public & ngo "green belt". In the Bay Area, there really is not just some new amazing new places to build. We must build up.