Jw...why are shield not effective? How do you define effective?The point isn't just about protecting the wearer from others. The point is that effectiveness goes down, and that can work both ways.
I support wearing masks, and wearing them effectively will provide better success. It's sad that so many people still want to dismiss everything that doesn't fit their agenda instead of keeping an open mind. People also believe in science until they don't.
Droplets vs particles? Really? Did we know that in the beginning? Does knowledge just stop when we get to a certain point? Distancing was originally 3 feet, then moved to 6 feet for 15 minutes. That's likely not true. Shields were effective, but now there are studies showing they aren't.
Just because we now believe droplets are the major physical method doesn't mean it can't be spread as particles. If wearing a mask is no big deal, wearing a clean mask should be no big deal, right?
I do not wear one fyi, jc