1-(Ok I'll ask the somewhat obvious:
What makes so many people assume those who got coronavirus get it/got it when they weren't wearing masks? Not very scientific of them.)
Interesting.

2-I don't think I know much more or less than average about mask impact, but if it were that simple, we'd all wear masks and be able to live otherwise normal lives at school, work, etc.

3-I don't think any scientists claim masks are always effective at preventing coronavirus, and they differ on how effective they might be. And I don't think any scientists recommend one wear them all the time.

I certainly am not trying to create controversy but I will tell you some prominent academic and govt. scientists working directly on coronavirus-related matters do not generally wear masks or isolate (unless of course they are in a place that mandates).