I disagree with this. Perhaps caring for your own kids produces much better kids (and eventually, adults). And that may be more of a benefit to society than a large number of people being incentivized to create large number of kids whose care is just outsourced to childcare centers where they receive less attention.
> You want to focus on raising your own kids, that's fine, but do it on your dime.
Is this really an argument for anything? One could just say “if you want to raise kids you can’t afford, do it on your own dime” and undermine your perspective.
In places with universal childcare provisions, one of the arguments is often that children in childcare tends to benefit from the extra socialisation. I don't know to what extent that is supported by hard evidence, but it's at least by no means clear that caring for your own children is a net benefit for society even direct economic arguments aside.