That is the topic of my latest Bloomberg column, here is one bit:
Before the vaccines came along, it made great sense to enforce masking norms. If infections could be shifted into the future, an eventually vaccinated citizenry would be much better protected.
There is a less obvious corollary: Those same mask norms make less sense when large numbers of people are vaccinated. Masking still will push infections further into the future, but if the vaccines become marginally less effective over time, as some data suggest, people may be slightly worse off later on (they’ll also be a bit older). The upshot is that the case for masking is less strong, even if you still think it is a good idea overall.
Still, many people prefer to abide by fixed rules and principles. Once they learn them and lecture others about them, they are unlikely to change their minds. “Masking is good!”