You're only focusing on the children, while the post to which you're responding explicitly calls out that they are only a part of the entire system. The fact that they don't get really sick or are asymptomatic is actually really bad when you're trying to reduce transmission.
Prompting the obvious questions (which I don't think have clear answers): How much do we think that it reduced transmission? How much transmission reduction is needed to justify knocking a year of socialising out of of a child's life?
What I'm curious about is why did we see so little effort to keep socializing available to kids without just going back to school? I'm not aware of a single place that made a noticeable effort to e.g encourage small fixed social pods to form, or run outdoor activities after school hours for the kids who wanted to be there, etc. Even among the parents who were basically fulltime campaigning to re-open schools for the sake of mental health, I didn't notice discussion of what they were doing in the meantime, and surely they were doing something.
