That's what I'm saying, there's too many people in houses that aren't the right size for them. It's not a supply issue, it's a distribution issue.
If you make 1100 dinners, and there are 1000 people, but you give two dinners to 400 people you're going to run out before everyone gets a dinner. There's no shortage of dinners though, it's simply a distribution issue.
People don't have to stay in a house that's far too large for them. Allowing or encouraging them to do so is actually a huge problem.
My parents are a perfect example of this, they have a house with 4 bedrooms, and a suite with 1 more bedroom. They had the suite rented out, but decided they didn't need the money so they stopped. It's literally just the two of them in a 5 bedroom house. They also have a one bedroom cabin elsewhere. Was that 4 bedrooms useful when they were raising my sibling and I? Sure, but we haven't lived there in 25 years.
We need policies that encourage scaling house size to family size, so that the distribution issue gets resolved. We need policies that encourage essentially force density in desirable locations. Those are the only way we solve the housing issue. We cannot, no matter how hard we try, build our way back to affordable housing.