I think you are on to something here.
The human immune system is incredibly proficient at killing harmful bacteria, germs and viruses. But it needs constant practice to be in top "fighting" shape.
Just like a world-class boxer will quickly lose his edge if he sits on a beach sipping margaritas, so our immune system will lose its edge if we constantly keep our bodies in a sanitized environment.
We need to expose ourselves to everyday germs to keep our immune system humming. I take a shower every day but I don't bother with those silly hand sanitizers you see everywhere and I don't necessarily wash my hands before eating (only if my hands are noticeably dirty).
As a result, I almost never catch even a common cold and after 55 years of living, have yet to spend a night in the hospital (except maybe the night I was born).
As for peanuts, I eat them by the pound.
The older I get I’m so glad I grew up as I did. Sadly it was in an America that has pretty much vanished. Played in the dirt and mud, played tackle football with no protection, rode a bike with no helmet. Drank from a garden hose, played with fire crackers, BB guns, heck , me and my friends used to hike for miles along an active set of rail road tracks barely dodging fast passenger trains and long, slow moving freight trains. Its a wonder we weren’t killed!
Generally, I agree with you. Kids should not be kept in perfectly sterile environments.
However, our immune systems are NOT especially good at killing *viruses*. Viruses have developed incredibly sophisticated schema to defeat our immune systems.
I have zero idea what the peanut allergy is, but it isn’t a bacteria; and it probably isn’t a virus. Not knowing much about it; but the onset of the symptoms is so fast....and so serious.