But it is not known how much more the coronavirus would have spread if there were no mask wearing.

Also the incubation period for flu is much shorter, up to 4 days as opposed to up to 14 for covid, so a much longer period for someone breaking the rules or being careless, to do so without knowing they were infected with coronavirus.

It would appear as well that the coronavirus survives on surfaces for much longer than the flu virus which is only viable for up to 24 hours.