The missing thing is health care. If you're young and immortal and willing to take risks, sure. This attitude won't last into middle age. My wife had cancer, and without health insurance I'd be a single parent right now. Maybe you can lean on public assistance like Medicaid (if it continues to exist), but this isn't really a scalable solution for "we can all live cheaper". It only works if enough people stay in the rat race to pay for it.
"Cheap" health insurance for a youngish small family is >$1000/mo. That really isn't optional in the US.