Person in car sneezes in hand or wipes nose or rubs eyes even with the mask on. Puts on mask. Touches or picks up anything in the house. Germs spread. The mask is damn near pointless. This coming from someone who wears a face shield, n95, shoe covers, a clothing gown and gloves and I've already had the virus in March and have antibodies.
It is a false sense of safety and is not the end all be all or a solution. Now it is becoming simply the PC thing to do or your company is viewed as "not caring" for your customers.