N95s work, which is what they should have been recommending all along. The Physics of the N95 Face Mask
There are no child development issues with masks. It's mainly parents acting like children who cause the issues.
So here's the thing. Governments are increasingly requiring boosters after you are double vaxxed; Hawaii is going to require a booster shot to be considered fully vaxxed and if you're not vaxxed and boosted, you'll need to provide a negative test or sit in quarantine. We know that being vaccinated twice against the ancestral strain doesn't confer sufficient immunity to prevent infection; what makes you think actual infection with the ancestral strain (or even with Delta) confers sufficient immunity against Omicron? The issue here is that unless you had the RNA from your positive test sequenced, there's no way to know exactly which strain you were infected with. So it's easier to just require a booster rather than have an entire flow chart that tells people whether or not they'd be considered fully vaxxed that changes constantly depending on what strain is currently dominant and what new data they're getting.
It makes sense. Your body produces antibodies against mutated versions of what it thinks is attacking it. It works kind of like a bell curve, with the center of the curve (highest antibody levels) on the actual attacker, and as the number of mutations gets greater and greater, fewer antibodies are produced, but they are still there. Somatic hypermutation - Wikipedia It's kind of like using shot instead of a single bullet; you can hit birds that you're not aimed directly at, but as the bird gets farther from the crosshairs, the probability of hitting it gets lower, and you're likely to have to take more shots to hit it. But yeah, we need Omicron specific boosters because the protection would be stronger and last longer.
My issue is with CEOs like Elon who throw tantrums like a 2 year old over having to shut down their factory due to public health measures. I'm disappointed that Alameda County caved. The Alameda County Sheriffs office should have physically removed Elon from the building and thrown him in jail, and shut down the entire factory (instead of just allowing it to operate at reduced capacity) for a while as a penalty for disobeying the order. He wasn't ever told that Tesla wasn't allowed to operate the factory at all, just that the number of employees who could be in there would be capped at a certain level. As it was, when he reopened the factory against public health orders, it resulted in more than 400 COVID-19 cases among employees. For Elon to be railing against the government in California and saying that it's trying to put Tesla out of business, etc., when it was the California government that basically kept his company afloat in the early days? I can't think of a better example of someone biting the hand that feeds him. No one, not the most powerful politicians, nor the CEOs of the biggest companies, should be above the law.
