Marginal benefit per percentage of masked population sounds like a very flawed metric for me.
As an individual, it's not for me to worry about. What I'd want to know if a room full of masked people is safer for me than a room where some people aren't wearing masks.
The marginal benefit, I'd assume, would be low if most people can't choose whether to be in such an environment. But I can. Masks working well wouldn't contradict them having little marginal benefit, as, say, 10% of unmasked people might be the 10% that have covid (and, let's be honest here, there is a correlation, since anti-maskers, anti-vaxxers, and anti-whatever tend to be the same people).
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Marginal benefit per percentage of masked population sounds like a very flawed metric for me.
As an individual, it's not for me to worry about. What I'd want to know if a room full of masked people is safer for me than a room where some people aren't wearing masks.
The marginal benefit, I'd assume, would be low if most people can't choose whether to be in such an environment. But I can. Masks working well wouldn't contradict them having little marginal benefit, as, say, 10% of unmasked people might be the 10% that have covid (and, let's be honest here, there is a correlation, since anti-maskers, anti-vaxxers, and anti-whatever tend to be the same people).