Earlier quoted context omitted.
What changed? Governments used to aggressively intervene in the housing market.
My hypothesis has been that renters stopped voting. They tend to be transient, younger, non-voters while landowners tend to be older, rooted and vote fervently. Density hurts landowners by decreasing property values and landowners vote.
Tell that to these folks:
https://twitter.com/curtlsmlchael/status/1606993882679590912
Upzoning in high-demand areas would unlock billions of dollars in value for existing homeowners.