We are now considered the top of low income/bottom of middle income and are very frugal. We live in the country where prices are much lower. But even out here we'll need 25k+ deposit for anything half decent.
It's way more complex than 'just save'. Of course some people renting blow their money, have poor financial skills and buy expensive prams then cry poor. You can't get a deposit living that way. But lots of us don't live like that and do have some savings but not enough.