>Closing schools never really made sense for the children once it was identified that the virus attaches via ACE2 receptors

After bemoaning failure to consider second-order effects this seems like making the same mistake - It was a good news that kids were less susceptible to severe infection but protecting children was not the sole purpose of closing schools. Kids were still susceptible to infection and could still spread the disease to adults. Schools were a mixing pot for kids to get infected and then go home to infect adults who might then suffer more severe effects.

I think even in retrospect it holds up very well as an effective means (amongst many others) of slowing spread.