Curious if you have any thoughts about the Slate Star Codex literature review on masks from around last April. It ends up slightly more sanguine that there might be very minor beneficial effects for masks (and especially fit tested N95s in the healthcare setting), though the real takeaway is the absolute dumpster fire quality of every mask study to that date. This was around the time that idiotic "peeing on each others' pants" meme was going around with unquestioned 30%+ effectiveness numbers, so it definitely sparked an interest in looking more independently at mask policy claims.

https://slatestarcodex.com/2020/03/23/face-masks-much-more-than-you-wanted-to-know/

Also reminds me of a great facepalm moment last spring where stores started specifically denying entry to people in N95s because they "had valves, so they didn't stop the spread of Covid".