cistran

In 12 months US experienced a rate of infection of about 33%. In 4 months, Indian infection rate will be about a third of that, so 10%, unless their dominant variant has a much higher R0.

How many cases of COVID were detected in your child's school in one year?

Have you considered the cost and benefit of masks worn by your six years old child?

Is he getting bigger benefit than you?

Are his costs smaller than yours?

If Alice also want to date Carl, David, etc, does she have to do it again and again every time? Wouldn't it be easier to do it once and put in into a blockchain?

Nobody seems to be doing any cost/benefit calculations on masks. Particularly when it comes to fully vaccinated people wearing them. Why are we not doing it, especially the cost part? The benefits at least are tractable. But the costs are not easy to calculate. Obviously they are bigger than the cost of masks themselves, time it takes to properly take care of them one way or the other, and the cost of their disposal.

But it is a bigger deal for children. Children can get complications from throat infections. 

You were looking at problems with one in ten thousand odds, but you don't have ten thousand acquaintances of acquaintances, so it is unlikely that you would get second hand reports of problems with these odds. 

You have even less acquaintances with children, perhaps no more than a few hundred, so even problems with odds of one in a thousand are unlikely to reach you via second hand reports.

Rare compared to what? I haven't seen actual studies but my anecdotal observations show about one person in ten wearing visibly moist and soiled mask. This maybe area dependent, so your observations may be different, and they are what matters. But kids are generally not as fastidious as adults. The main worry for young kids is how much more likely is the bacterial throat infection if the mask they are wearing is dirty. Here is a relevant article (https://health.clevelandclinic.org/can-you-get-a-sore-throat-from-wearing-a-dirty-mask/)

Acne aggravation from mask wearing is well-documented, but your kids are too young for that problem. 

Have you looked into risks improper mask wearing poses? Things like moist dirty masks and associated  increased chance of bacterial infections and aggravation of acne. Children wearing masks in school are especially at risk of wearing masks improperly.

A potentially more interesting question is what vaccine effectiveness as a function of time looks like near its protection expiration date. Not much data to answer this one yet. May become relevant in 6 months in a worst case.

Here is another ironman for FDA decision based on nothing at all. What if they are scared of unknown long term effects and take any confirmed problem as a red flag pointing to unknown long term effects. This would push them away from moustache twirling villains category.