I think the term "poorer", and the monetary analysis done here, is too high level to extract real meaning. The average young person/couple that I know are able to do and buy far more than their parents (e.g. eat out, order takeaway, take holidays, go to bars, buy things for hobbies, buy clothes, ...). They just don't own property and have no path that leads there. In some sense you could say that they have higher inc…
I think that they eat out and order takeaway because they perceive that they never going to save enough money to afford a house.
I don't personally subscribe to this mentality — I've seen other friends save up $50k, double it with patient investing, and then scrape together a down payment. Even if you end up leaving SV, having had property here can be a good investment.