> The problem with that is two-fold: first, the median childcare worker is less concerned with the child’s long-term success than is the median parent
Two of my siblings are primary school teachers (that is, for kids who come right out of kindergarten; not sure how this is called in the US/elsewhere), and from the stories I've heard from them, they'd argue heavily against your points.
I think you're underestimating how many families are completely dysfunctional, or where the parents are overwhelmed with taking care of their children, even under normal situations, let alone during the current pandemic. For example; where I live, it's unfortunately still often the case that schools do not take care of lunch for the kids (they are supposed to go home during lunch breaks) and the amount of times where teachers have to wonder whether the kids had anything to eat at all for lunch (sometimes because nobody is at home and they didn't feel hungry at the time or had only junk available) is astounding.
Childcare workers are trained and certified for their job (that's at least the case in my country); and yes, while they have many kids around and thus might not have as much interest in an individual kid as a parent might have, they at least have to uphold a certain level of competence in order to keep their jobs (essentially, like the rest of us - be good enough at your job or search something else), while a parent stays a parent, no matter how bad they are at it.