While I personally agree with this sentiment, the last few years have made it amply clear that the population prefers padded rooms to icky playground sandlots.
Nuance: They're still getting exposed and thus gaining immunity with the environmental filtering, just not so much viral load as to be out of school [as often].
It's a win-win from that perspective and dismissing that serves no one in the end.
This tiny but significant factor is also why masks, even surgical masks, are so helpful. They don't need to prevent 100% transmission, just reduce the viral load received or passed on.
