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Ones of all design do help with droplet suppression. They do sweet f all for airborne unless properly fit and of the right rating. Covid for all practical purposes behaves like it is airborne. If you haven't realized this by now, I don't know what to say to convince you.

Maybe these will help:

https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article

https://www.acpjournals.org/doi/10.7326/M20-6817

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I already said that not all masks are the same.

But any mask is better than no mask. Which is what happens if you mandate a far more expensive and harder to get N95 variant.

" In theory, transmission should be reduced the most if both infected members and other contacts wear masks"

Wish you had read the studies you posted

I did actually. That line you quoted was what they (and most all of us would expect).

The data didn't prove it out though, they report this in their analysis: "We did not find evidence that surgical-type face masks are effective in reducing laboratory-confirmed influenza transmission, either when worn by infected persons (source control) or by persons in the general community to reduce their susceptibility"

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