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Given how contagious omicron and later variants were, no one avoided covid without total isolation. At most you never tested positive.
That's not true but okay. It would take quite the consisten circle of asymptomatic contacts for what you said to be remotely true.
It really just requires people not testing. A runny nose is technically symptomatic, but I doubt most people tested every time they blew there nose more than average.
I live in a house with four other people, all of which have had it at one point or another. Usually one person gets it and wears a mask around the house so it doesn't end up spreading to anyone else. I've managed to not get it despite testing every few days for a couple of weeks after it has been in the house