Thanks for putting this together. Sad that the platform you use (or the blockchain itself?) limits posts to such a small size. Not that there isn't a lot of info here, of course, just saying a full article should be able to fit into a post!
I'll check out part 2 later. Lots here to digest already! One thing that came to mind...
"Until 2020, universal societal masking was an entirely foreign concept to most"
How about certain asian regions of the planet where almost all of the population masks in public? I lived in Vancouver for decades, and saw masks come into style among the asian community. Over time, it rose to about 50% of Chinese people masking in public, and since 50% of Vancouver is Chinese, it resulted in about 1 in 4 people being fully masked at all times. Surely some data exists on health issues this has caused.
Also, how about muslim regions? In some cases, for thousands of years, the entire populace has used cloth face coverings in public (or, half the populace has). What is the incidence of bacterial pneumonia and other health issues in these populations? What else can we learn from these examples of widespread masking?