As a person who is in this age range and in essentially the opposite position--my disabled mother and college age sister live with me in coastal California--the kind of thing you're describing with the guy who wouldn't come out of the room is bonkers. I know this kind of person exists as an archetype but between your anecdote and the article I'm just baffled at the apparent prevalence.

I guess part of it is the fact that my circumstances didn't even make that lifestyle an option. By my late teen years it was increasingly obvious that I had to go in the kind of direction I did if I wanted my family to have a decent life. If I had a middle class nuclear family, is it likely that I would've tore through CS classes and leetcode as much as I did? I kinda doubt it.