Earlier quoted context omitted.
When I read things like this I find it confusing in so many ways. I've been out of the US for a while now so perhaps there's some contemporary issues I'm just not considering? For $6k a month, why not hire a private nanny? You could also work with other parents in your area to setup something for a bit more socializing depending on their age. Similarly, I find it practically impossible not to meet people literally ev…
Say you hire a nanny for $6k/mo... What problem have you solved? You're still paying the six grand, and you had better hope the nanny is good, because that is your kids' whole world now for a chunk of their existence.
It's also done at your house so there is no transport, you can create play areas and the like to your own imagining, set the standards for what is expected, have easier access to the exact foods/etc you want your children consuming, and so on. You also have a lot more freedom for your children to experience things you want them to. For instance if you want your kids to go to the park on Wednesdays, you can set that up.
There's also small things like the fact that most kids are going to get endlessly and repeatedly sick in daycare due to close contact with a large number of other children and relatively premature immune systems - when anybody gets sick, most of everybody gets sick. Some of those will be one-time-only sicknesses that everybody will get, sooner or later, but a lot are just colds and other things that kids will catch endlessly. And so on. There's plenty I'm leaving out but basically you get better, more personalized, care over which you have much more control, and pay less.
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One thing I'd also add on. I'm not even entirely sure a "good" nanny is required. They obviously need to know how to care for a child and so having one who has had at least one child on her own is good, and bordering on a requirement, and they should know basic first aid and emergency treatment (like what to do if a baby is choking), but beyond that - I think the most important thing for a child is simply the personal connection. If somebody gets into nannying they presumably already love children and, at least for me, that's mostly what I'm looking for.