So, with surgical or medical masks, they are pretty certain that it has some impact. But they don't know how much.
That all seems reasonable. I agree with the idea that good masks, worn (and disposed of) properly, can have some positive effect.
My problem is the idea that we want everyone to wear masks, to reduce "asymptomatic" spread, while not mandating quality, or cleanliness, or even that it is kept on at all times (we will make exceptions for eating, drinking, etc.).
To me, it all seems very arbitrary, and that people are more focused on seeing the "symbol" of the mask, than they are in being certain that the safety precautions are being carried out the right way.
The industries you listed above have been at risk regardless of mask usage and as a direct result of the virus as a whole. Until we can get it under control, it only stands to whit that those industries will continue to suffer. Conflicting information from our government (not the scientists) has been the issue.
I think your last statement is why both "sides" seem to view mask wearing as something other than an additional layer of protection. Some people see it as a restriction of rights and some are viewing it as an opportunity to shame others for not wearing masks. I would argue that having a discussion about why masks are important is helpful.