I really don't think the question of whether mask mandates reduce overall cases in a country over a period of time is settled.
If you look at the table of deaths per 100,000 caused by covid, you would have to torture the data to decide that stronger mask mandates correlate with lower deaths for European countries.
Czech, Bulgaria, Italy and Belgium, for example, have all had much harsher mask mandates than we have and all have higher deaths.
If you look at comparisons of mask mandates in different US states they are very weakly correlated with fewer covid deaths (barely statistically significant) and states with harsher mask laws generally had harsher lockdowns in general.
What we can say beyond doubt is that they have not prevented exponential growth of covid.
I think there is a huge difference between studies in a lab which show that you breathe out fewer droplets wearing a mask (and I can well believe this is true) versus looking at how they have performed in the real world over a longer period. It may be that you can show a small benefit in the real world if you look at the data in the right way but it is very difficult to show a significant one over time.
So I think the pro mask camp overestimates the benefit at a population level (and underestimates the downsides which for me are much more about communication than comfort). And maybe vice versa for anti-mask people.
Also, if you are arguing for mask mandates to remain in place on the basis that this might protect vaccinated vulnerable people, I cannot see how this rationale will ever change. CV people will likely always be at some risk from covid and other viruses (and other viruses which we don't vaccinate against could well pose more of a risk than covid, which we can vaccinate against). The risk may be less than it is now at some point depending on case numbers but it will still be there. I think if it is your view that we should wear masks indefinitely to protect vulnerable people you should be honest about that (or explain when you think it might be reasonable to remove the mask mandate). A society where everyone is masked long-term in certain situations has different implications to this being the case temporarily (e.g. on children's speech development and the ability of deaf people to participate in society and potentially lower immunity to common illnesses in the whole population).