

On your second point, the Mayor Clinic states explicitly that masks protect the wearer from getting infected by other people. The NIH says the same, as does the CDC. Besides that, N95 masks were quite difficult to get during the pandemic. I never saw them for sale. The closest I found was KN95, which are made to a more lax standard and difficult for me to breathe through.
If an OSS project wants to thrive, it would behoove them to implement things that people want. I don’t think there’s a one-size-fits-all solution there, but they shouldn’t be surprised if nobody wants to use their software because it doesn’t do what they want.