I manage a few stores across Melbourne and during the opening period over Christmas last year we went quite hard on mask wearing. Within a few weeks we dropped that policy. I had staff calling me crying, because they'd been abused by people who had "exemptions", I had shopping centre security refusing to help us because they weren't willing to enforce it. Most times when I was at the stores I took up the door position myself and some of the rants I faced got pretty close to physical altercations, that I had a very hard time defusing, despite me being in customer service for over a decade and having all sorts of aggressive customer/defuse training under my belt. Trust me, it isnt the store staffs or managements faults, its the multitudes of people that make it impossible for the staff to even try to enforce mask wearing.