Cam MacMurchy, 9to5Mac:

I know it’s not too common for people to be out and about wearing masks in public in the United States, but it’s fairly common over here in Asia. The thinking behind it is actually to prevent you, the mask-wearer, from spreading your diseased germs to other, healthy, happy people.

And:

The Coronavirus, obviously, is different: doctors are recommending people wear masks to prevent coming into contact with the “novel” virus, thus keeping yourself safe. But the masks cover a huge portion of your face (even a big face, like mine) basically invalidating Face ID. I know, I know, this sounds very trivial, and it is. But trivial and annoying have long conspired together to cause great anger and frustration.

This is an interesting perspective, and makes me wonder if Apple has a team working on solutions to open your phone when wearing a mask. Perhaps a smarter, eye-centered Face ID, or a combination of Face ID and some other biometric (perhaps Touch ID as an additional option).