Why isn't "Multi-Gen Living" a part of the conversation?

As we discuss about how housing becomes a luxury in an economy thats diving into luxuries, I keep seeing everyone frame the problem as "renting vs buying". But for me, all I see is luxury rentals and the real comparison should be having your own housing vs living with family like they do in other countries that have great inequality. In practice thats what I see: more people living with parents/in-laws after marriage, living "in the basement" after college, etc. So why are we still comparing rent cost to mortgages, according to the Cantillon effect hasnt that become redundant?

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