For a couple of years I was annoyed by the need to unlock my iPhone with the passcode, as I am wearing a mask most of my workday as a beekeeper. Just now I learned that all I need to do banish this small but frequent inconvenience is to train the face recognition software with my mask on.
Here is the procedure: go to Settings > Face ID &Passcode > turn on Face ID with a Mask.
Super simple, yet a great time saver. Makes me think how many other small hindrances and frictions I have in my life which I could remove in such a simple way. Probably not that many, but still an intriguing thought.