Thinking about it some more, I suspect the disconnect between us is that you think the primary way of getting sick is breathing the airborne virus. Whereas I think the primary way of getting sick is touching your eyes (or picking your nose). So you want the filtering to be good, but I just don't want infected snot droplets to be blown everywhere.

Now, I'm sure someone will throw an obnoxious "citation needed" reply...

Are you really wearing a mask which is tight enough that _all_ of your respiration is going in and out through the material? If not, your argument/question about filtration isn't very relevant.