"Masks stop respiratory droplets sometimes!" is a ridiculous exercise in surrogate outcomes
We KNOW that masks are unlikely to prevent community acquired infections. THAT'S what we care about, not some statistics on particulate movement #COVID19
Working is a function of use. If it was a drug that only worked for a small proportion of people in per-protocol analyses, we'd absolutely conclude that it was ineffective
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But if there were a drug that people just for whatever reason did not want to take 50% of the time we would not conclude the drug was ineffective. We'd look at ways to increase people remembering to take it, like phone app reminders.
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I'm not saying people don't ~want~ to use it, I'm saying in clinical trials people ~don't~ - because of discomfort, perceived value etc - which is a very different argument
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