And where do you get N95s that filter outgoing air effectively? Besides, even these N95s are leagues better than the Chinese mass-produced KN95 junk you see on something like Amazon.
Edit: www.cdc.gov/coronavirus/…/free-masks.html
Here the CDC lists brands and models of masks that are effective in protecting yourself and others. As you say, the 8511 just happens to be one with an exhalation valve. I do remember the CDC explicitly saying exhalation valves were a no-go during the pandemic, so I don’t think anyone looking for N95s for COVID protection would buy masks with valves anyway. There are other options available from hardware stores.