N numbers don't actually mean much in the real world if people aren't using masks (a) all the time, and (b) that fit perfectly. And everyone is different, but nobody follows both of those rules all the time. My guess is that you do it better than the average person. I'm close to 99% sure of that assessment. Most people are some combination of uneducated and lazy, so imperfect as the study is, I think they were trying to measure what happens in a real-world scenario, as opposed to a laboratory setting, whence the N's. I agree with most of your critiques, but I think simply pointing to N numbers is too simplistic.