True, but the ability to do so depends on where you live.
I also am in a one-income family (mine). We live in a rancher in a not-so-nice neighborhood. So I can manage the mortgage payment.
We started out in a basic starter home. We would periodically upgrade to a larger home in a nicer neighborhood when my husband’s income grew. Roughly 7-10 years before we could make the jump up and keep mortgage payments about the same. We also had only one car for quite some time. It wasn’t till we finished our payments on it that we could eventually afford to have two cars. The kids wore handmade, used, or hand me down clothes a lot, with the exception of a couple of new outfits for each season. I cook mostly from scratch, and use fresh produce daily. For many years, our family vacations were nearby, and very often involved camping. There are lots of ways to economize. You just have to have the determination to stick together through thick and thin. It might not be easy or luxurious, but it can and does happen. Oh, and now we are finally in our dream home.