I agree. However, the requirement, as it stands today, isn't very science based either. Not trying to get into a mask debate. If the requirement were that all passengers must wear an N-95 or equivalent mask, then that would have a basis in science. But where the requirement is "a face covering" then it's not. The science proves the aircraft filtration is highly effective, but won't do much to protect you from the passenger sitting right next to you as the air you're breathing won't be filtered before whatever they are exhaling gets in contact. But the non N95 mask they, or even you, may be wearing won't help much either.