I think a more apt question is: what is it about our economic system that creates a situation where the people in the top 25 percentile of earners are incapable of supporting themselves financially?
That said, with a few lifestyle changes, I believe someone making $150k per year could make it work in most, if not all, major US cities. It might be a small one bedroom apartment, and you might need to walk or take a subway to work, but it can probably be done.
I think a lot of people who grew up in the 90s and early 00s working class kind of saw $100k/year something to aspire to (at least where I grew up). Like, if you could make that much, then that would mean you’d be more than set. These days, not so much. It’s hard (for me at least) to remember sometimes that it’s really not that much money anymore.