Funny you say this, because where I work, we wear masks if we've had contact with someone with COVID and after coming back to work after being gone with COVID. Unless you're talking about masking all day everyday.
Yeah, wife and I just had covid and we broke out the masks for a few days. We'll probably do the same if we get the flu. I figure we've got 20 neighbors on our floor and maybe 10 are likely to get flu/covid in the next 12 months, so I'd be directly responsible if I got the 11th one sick in the elevator. That said, it wasn't that inconvenient since we're wfh, so I can see why people do different math.