Mask-wearing rules were wholly ineffective against COVID-19, and they are equally ineffective against the various forms of the flu or any other virus.
Masks did NOTHING to prevent the transmission of COVID-19, and they will not work for much of anything else, except to stop the inhalation of dust particles large enough to be caught in the pores of the mask fabric.
Fresh air and sunshine are effective, so no lock-down, and no artificial face coverings.
Those aren’t masks.
They’re muzzles.