I think you're conflating discussion of what individuals should do with what the city should do.

Should workers vote with their feet for remote first companies? Absolutely. But that doesn't mean SF shouldn't also build more housing.

Saying you shouldn't build housing because people will just buy it all up it is like saying you shouldn't grow food in a famine because people will just eat it. The problem is that demand and supply are massively out of step, and that means you need to build a lot before it starts to even out.

And sure, there are political reasons it doesn't happen, but that doesn't mean it's not a good idea.