I have been really curious to see what a rigorous, randomized, large scale study on masks and COVID 19 would show, testing community transmission (i.e. source control) and we finally have one. 342,126 adults over 6 months in 600 Bangladesh villages.
It's inconvenient for mask promoters since cloth didn't make a noticeable difference and surgical didn't make a big difference. It's inconvenient for mask skeptics since surgical did make a difference. Probably 74 out of the 100k didn't get sick and maybe a life was saved.