I think screens in shops, where possible, is a good idea to protect shop workers but I'm not convinced of the benefits of face masks and/or other "precautions" we have been taking. If face mask, distancing and self isolation reduced the transmission, why are there still so many new positive tests every day?
I am very much in the "we have to learn to live with it" camp and personal responsibility needs to come into play much more - as someone said earlier, they will probably go shopping off-peak to avoid crowds, that is exactly what I am on about. We need to try to get back to a more normal life (I want a life now, not an existence!) and so if are still feeling vulnerable or do things differently to try to reduce your risk you are more than welcome to do that eg shopping off-peak, wearing a mask.
Every day we take risks - eating, drinking, smoking, driving a car, even walking in the street all have an element of risk of injury or possibly death - we can't avoid risk and we need to get the Covid risk into perspective now rather than trying to eradicate the risk entirely (which we will never do) and make our own decisions about what we do and don't do each day.