Earlier quoted context omitted.
I think there's a more concrete measure of value: house prices related to income. Historically (Robert Shiller has a chart for the US going back to 1890) house prices (and mortgages and rents) have maintained a stable relationship with income. Occasionally that relationship is strained but it has usually fallen back in line. One exception to this was the extraordinary, ongoing, support to the financial system post-20…
There’s no rule that you should be able to afford a house on a middle class income. In fact in many countries, particularly in Western Europe, it’s unimaginable that you would be able to afford a detached, single family home on a middle class income. Lots of people in that situation will live in apartments, row houses, or condos for the rest of their lives.
In which case the two are comparable: there are few if any middle-class families in the bay area that own their homes except by inheritance or some other luck (gift, lottery). Even condos and other high-density housing are all but completely out of reach for all but the top 10% of income earners. And those condos are almost all studios or 1- or 2-bedroom units that are very tiny.