I understood your point. But I think you have to apply an intention to treat analysis, for social distancing + masking, like any other treatment. It has to not only work in ideal experimental conditions, but in practice. "Social distancing and masking reduce the spread of infection," may be a true statement. I believe it to be true.
But this might also be true: "Social distancing and masking reduce the spread of infection, when the time prescribed is brief, self limited and focused enough that a critical number of people will do it. It doesn't work if it's required always, all the time, in all instances, for years on end with no end in sight. Such application causes people to lose the belief in its effectiveness. The one thing social distancing and masking need to be effective, is a collective belief in their effectiveness."