"Affordability" is more than just rental prices which is why I think building more units is insufficient.

You need to address wages as well.

> Then you're making it de facto illegal to build new housing. No bank is going to lend money to anyone to build more housing if they can't charge enough rent to cover the loan.

This implies you think landlords are trying their best to lower prices, only charging enough rent to just cover their loan payments, which is absurd.