Yeah, they're certainly not comfortable, but they're one of the easiest ways to help prevent high viral loads in confined spaces full of people. The fact they're not mandatory on public transport right now is completely baffling, as the effectiveness is directly related to as many people as possible per journey opting-in, so that if someone is asymptomatically carrying COVID it is contained more effectively than it would be without a mask. Same goes for flu or even the common cold.