I'm not sure I'd use your kids alone as a representation of the experience of day care for the entire population.

And you're only counting the benefits of daycare, but ignoring the opportunity cost of less time with parents and the benefits that come from that.

I don't disagree that there are benefits to daycare, but where is the optimum? A few hours a day? Or the kids in daycare from 8am to 6pm, so they see their parents for maybe 2 hours a day before bed time?