Exactly. It's only useful to poor people who already get tons of gibs anyway. Either subsidize daycare, create a new federal daycare corps (lol), or make it so one parent can support a whole family again.
For all the dumb shit she says in general, and even though her ultimate prescription is nonsense, Elizabeth Warren's analysis of economic conditions and its effects on households in The Two-Income Trap is dead on. That book also obsesses with women, ignores that men can be domestic as well, and dismisses the idea that it's maybe a good idea for a family unit to have someone available to take care of domestic problems (e.g. a child is sick and needs a parent to care for him or her); but Warren is still right that economic conditions trick middle-class households into thinking having two incomes will fix things, but it won't.
Raise wages, fix inflation, and stop telling parents to basically enslave themselves to banks by sending their kids to colleges which no longer translate to more income.