Not everyone can afford to have someone else clean for them. In fact, those who can afford it are a small and privileged group even in cities like NY and SF where they're relatively highly concentrated. The article above is specifically about average families in parts of the country where jobs paying that kind of money are extremely rare.

And if you don't clean a certain minimum amount, yeah, your home gets unhygienically disgusting. As proven by the 6 months of beard shavings and toothpaste spittle crusted up on my ex's sink. (And that was the least disgusting surface in the bathroom.)

The same goes for things like washing bedsheets and towels now and then; leaving clothing all over the floor where you trip on them in the dark; letting dishes pile up in the sink until you get pests; and more.

Technology has decreased the amount of time required to keep a home to a minimum standard of cleanliness - but it still requires a certain amount of attention and effort.

Then if you have a partner who's either unwilling to clean or whose standards for "gross" are far lower than yours, you're stuck cleaning for two or living in conditions you find unlivable.

And that's without even beginning to get into the complications of childcare for those couples who want children for reasons other than social pressures and norms.