The Midwest and the South are both way ahead of California on the whole "just build more housing" thing, for example, and have been for many years. And yeah, it makes us somewhat cheaper than a coastal city if you have California dollars to burn. But our Price-to-Income-Ratio's are still in the high 5-7+ range too, just like everywhere else.
We have basically zero population growth, and every single stray piece of land is getting built on right now (record high construction, record high new housing starts, for the past three years straight) and housing prices still rise 10% to 15% every single year like clockwork, with no end in sight.
"Just build more" sounds really pretty, but that alone will never get housing prices back down to a real-world-affordable figure for most people.