Why would any of that be specific to millennials, though? The way you’re describing it nothing would have changed in a very long time.
I’m pretty sure the “I’m too poor to have a family” perspective stems directly from the wild increases we’ve see in the price of housing and not a whole lot else.
That's the point - nothing has changed, except the narrative.
The wild increases in the price of housing is a symptom of the same dynamic we've seen throughout time, of competition over resources and survival of the "fittest" (where "fittest" occasionally means most brutal/devious/selfish). The differences are that a.) The (white) Baby-boom generation (in the U.S.) bucked the trend and enjoyed abundance and very little selection pressure. Note that the story was very different if you were black (where you had the gains of the Civil Rights movement, only to have the rug pulled out from under you with the 70s inflation and 80s crack epidemic) or if you were Chinese (where you probably died in the Cultural Revolution or Great Famine) or Russian / Eastern European (where you likely drank yourself to death after the breakup of the Warsaw Pact). And b.) that in our "civilized" society, we prefer to let people die rather than kill them outright. Not so for the WW1/WW2 generation.
I’m pretty sure the “I’m too poor to have a family” perspective stems directly from the wild increases we’ve see in the price of housing and not a whole lot else.