It's quite easy to see in supermarkets in Victoria for instance, as soon as the mandate was removed the customers whipped them off almost instantly, and there has been a corresponding rise in cases, however it's not resulting in massive fatalities as everyone is vaccinated. So it can be reasonably assumed that while masks work, they are not required for most of the population as Covid has lost its bite for the majority of the vaccinated. This is where the stupid message of whether masks work or not is just making the argument stagnant, the discussion is more about whether they are needed vs the severity of the disease.