We have about 100 years of data on paper/surgical masks lowering transmission of water-droplet carried viruses. You have a couple of epidemiological studies of questionable import. I do not think Delta, nor any other covid variant, has changed the size of the water droplets a human expires. I will accept the results of a century of testing until given a better reason to reconsider.Wearing a mask is neither a service nor a shield. There has been no measurable benefit since Delta.