Coup Droit wrote:

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There is quite a lot of evidence that wearing masks (especially N95s) also provides reasonably significant protection from catching the virus and also in reducing the viral load, meaning the infection will be far less severe

The most recent are such as:

www.nejm.org/doi/full/10.1056/NEJMp2026913
www.sciencedirect.com/science/article/pii/S0021850220301063

Indeed, even the Mayo site you cite says "an N95 mask offers more protection than a surgical mask does because it can filter out both large and small particles when the wearer inhales", i.e. give certain protection to the wearer (who's inhaling) from being infected.

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Definitely no expert on face masks and opinion on N95 seems to vary depending on which website/article you read, (ie virus permeable/virus filtering), whether the mask is correctly fitted. how the mask is removed etc. The things  the KOL's seem to agree on is face masks stop the spread by catching droplets and are more effective when used in conjunction with social distancing and hand washing.

The majority of shoppers I have encountered are wearing cloth or surgical masks, I have also seen some users of N95 with filter.

 "At this time, the U.S. Food and Drug Administration has not approved any type of surgical mask specifically for protection against the corona. virus."

"N95 as the name indicates, is designed to block 95% of very small particles. Since the coronavirus is an extremely small virus, it can pass through the pores of both the surgical mask and N95 respirator."

"Some N95 masks, and even some cloth masks, have one-way valves that make them easier to breathe through. But because the valve releases unfiltered air when the wearer breathes out, this type of mask doesn't prevent the wearer from spreading the virus. For this reason, some places have banned them."