I stayed at home with my mom until I was old enough for school. My wife and I sent our kids to daycare.

Our kids are fine.

Turns out kids need a lot of time with other kids.

It turns out that kids raised by their parents still get a lot of time with other kids though. Their parents don’t just keep them at home. They meet with friends. Go out and play. Their parents take them to classes and activities. Your view is “our kids are fine”, but most parents may say that about their own kids without knowing what the alternative could be. I’ve experienced both situations myself and also observed it as an adult. I think most childcare is a lot more of a free for all than parents think, rather than some sort of well designed experience. If you reduce the ratios significantly by having two kids per worker, maybe the quality improves to approach what a parent can provide. But that’s a lot more expensive.