I remember early on that specialists discovered COVID-19 starts replicating (weaponizing itself) as soon as it gets in your nose. Previous coronaviruses didn't replicate until they got in your throat, bronchials, or lungs. Soon after that discovery, those specialists and others said that, because of the nasal replication, wearing a mask was ineffective, arguing that, mask or no mask, you have to exhale, and all masks allow you to do that. But you're exhaling a live, possibly already weaponized virus. That's why coming to what is a safe distance became so important.
Also, that's why they talked about respirators and people having to wear tanks on their backs, and about the cost and practicalities of that being prohibitive.
I clearly remember this whole argument. It was pretty short-lived.