Ah, this is the perfect summary to explain to people when they ask "why are you still wearing a mask? COVID is over" or similar queries invalidating my caution around this virus. Worth noting is it was the 4th-leading cause of death in 2020 and 2021. Not sure why this is being downvoted into oblivion, as I regularly get some hassle from people about my strict adherence to wearing a mask indoors around people, and the…
People shouldn't bother you about wearing a mask, or bother storekeepers who request patrons mask, but a reason to push back on state-mandated masking isn't that COVID isn't serious (it clearly is), but rather that the empirical evidence for masking, especially vs. the new strains, is quite weak
If you're wearing an N95 or KN95 the filtration efficacy is quite high. Most of the mask studies looked at whether mask policies lowered covid.
If you wear a mask in class but then take it off in the cafeteria or outside of school, the mask no longer has an effect.
If, however, you wear a mask with high filtration efficacy while outside of the house, that's a different story. To my knowledge we have no challenge trial of people wearing such a mask when exposed to an infectious agent.
It is folly to ignore the physical mechanism of such masks when reasoning about them, and defaulting to only considering the studies we have, which simply cannot measure efficacy when the mask is worn.
This study on parachutes is a good analogue: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC300808/