[salmonellaeater]

> There are no downsides to wearing a mask.

You can't see people's full facial expressions. I wouldn't be surprised if the toddlers in daycare during 2020-2021 end up with deficits in social perception. For adults who already have a hard time inferring other people's emotions, masks make it worse.

You can't identify people as well if they're wearing a mask.

Aerobic exercise and hard physical labor are difficult or impossible wearing a mask (try breathing through a mask once it's saturated with sweat, blocking the airflow).

It fogs up glasses.

I'm sure there are others, but you get the point. Wearing masks has real downsides that need to weighed against the protection they offer.