> If worse comes to worst, you can move another hour or two away from the big city.

It is rarely the case that someone who can't afford housing in their current location can afford to move away from their support networks to a place with no jobs. Places with significantly cheaper rent almost invariably give you significantly less income, if you can even get a job without connections (which are important in general, but especially important in rural areas where everyone knows each other). That can work out for you if you have substantial savings or a comfy remote tech job, but if you have those you probably don't need to move in the first place.

Your other points are valid ways to technically scale housing down but, I think, bring with them a significant decrease in quality of life that far outweighs what is gained by being able to afford 500 big macs and 10 pairs of shoes.