I thought that correlation does not mean causation. There are instances where the use of facial coverings have been correlated with a reduction in spread, but that does not mean it was the use of masks was the reason.
A friend of mine noted that the number of daily cases where he lives has increased since he started wearing a N95 mask. Him wearing a mask now is the cause, right?
I have seen a bunch of references to The Lancet's meta-analysis of ways to reduce spread (including masks and face coverings indicate that that study says that "mask use" significantly reduces the risk of infection, but that isn't what it says. What it says is:
Face mask use could result in a large reduction in risk of infection (n=2647; aOR 015, 95% CI 007 to 034, RD [risk difference] 143%, 159 to 107; low certainty), with stronger associations with N95 or similar respirators compared with disposable surgical masks or similar (eg, reusable 12–16-layer cotton masks; pinteraction=0090; posterior probability >95%, low certainty).
Here is FiveThirtyEight's take on wearing masks.
I have seen a lot of these articles write a little bit about some study, referencing it and usually mischaracterizing what the study said, and spend most of the piece reporting on the speculation of some medical expert and restating facts about historical infectious disease outbreaks that match the pattern of the speculation. But, don't worry, when it turns out that they were wrong (remember how COVID-19 was going to slow down in the summer?), it will be like that speculation didn't exist and they move on the next speculation.
I am not saying don't wear one if you around folks that you don't live with. But I am saying that the science doesn't support claims being made about the effectiveness of masks.