These studies do not support any claims regarding how covid spreads.
I suspect the main reason covid spread doesn't correlate with mask wearing is due to the size of the particles/aerosols, so few are wearing filtering masks (what you would wear in a painting booth), and so few masks are sealed around the face. And then mask discipline.
What I have observed is that masks are used a social queue; people wear them outside in public to signal "don't talk to me", and remove them in private when with friends. This behaviour is opposite of what would be effective, given that the right sort of masks are used, which is almost never the case.
I suspect the main reason covid spread doesn't correlate with mask wearing is due to the size of the particles/aerosols, so few are wearing filtering masks (what you would wear in a painting booth), and so few masks are sealed around the face. And then mask discipline.
What I have observed is that masks are used a social queue; people wear them outside in public to signal "don't talk to me", and remove them in private when with friends. This behaviour is opposite of what would be effective, given that the right sort of masks are used, which is almost never the case.