That is a dual edged sword. We need people, especially kids, to develop immunity. That means exposure and with that, hopefully limited illness. Most masks I see out in the world aren't very protective, so consistently wearing one (Mandatory Masking) in crowd events like concerts, classroom, retail, in or by food service, especially farmers markets, where there are activity aerosols, makes sense. For decades, children were brought to other ill children, for immunity boosting. Flu was reduced during Covid masking. Masks come off, people crowd up, limited immunity, boom, you're down. It's a process.