Then you are sacrificing the well being of children, and their social development, for some perceived (likely minor) benefit to decreasing spread to older family members. But it worse, because Covid is becoming endemic. It's a coronavirus. It is never going away. We are going to have Covid infections forever. So what has been gained?

It would be much more beneficial to encourage weight loss and fitness regime for overweight people. The vast majority of deaths have occurred from overweight comorbidities. But this has never been widely addressed as a tactic to decrease severe cases.