Those studies all have fundamental flaws. The basic problem is those are associative studies, which can’t separate the effects of masking from the normal curve

Those studies all have fundamental flaws. The basic problem is those are associative studies, which can’t separate the effects of masking from the normal curve of a viral epidemic. You are right though I should have been much more specific than just “study”. A question though: if masking is so great, why wouldn’t the health authorities have performed an actual RCT to conclusively prove they work? (We have one RCT for SARS-2 which showed no statistically significant effect on the primary endpoint)