Here is text from a former professor who has a PhD in virology, specifically focused on Influenza:
tl;dr version: I'm neither pro- nor anti-mask. I have been wearing one when in public, and will continue to do so. I think it's a much more complex issue than most people realize, and people want to buy into whichever information they find that supports their particular opinion on it. Masks alone are not the cure-all to this thing that a lot of people would like to believe.
Longer version:
People don't understand a.) how much we still don't know on this thing's transmissibility and b.) aerosolized droplet sizes vs. pore sizes of a variety of mask-making materials.
Do masks likely catch a portion of the aerosolized respiratory droplets that could contain this virus? Yes. But they certainly don't catch them all, and it'd be HIGHLY dependent on the mask material used and the behavior of the person using it. This is true of all barrier PPE, and the behavior part is why condoms sometimes "don't work." It all comes down to how effectively people use them.
And therein lies the problem. It's the same problem we had back in the influenza pandemic of 1918. Masks likely do SOME good - but only if people widely embrace them, use the correct ones, and use them correctly/change them frequently. Think about your experiences in the last few weeks - do you think people are doing those things?
There was a ton of back and forth on masks back in 1918, too. When enough people are steadfastly refusing to use them, and if people aren't using them properly, it muddies the waters of results obtained by their use.
It's also not correct to assume that masks are the only variable here - how strongly people socially distance, and what other behaviors and activities they engage in are all at play.
Be honest with yourself, no matter if you're firmly in the "everyone should wear one, 24/7" or the "masks are an impingement on my personal freedoms!" camp - when you point out a study...did you actually read the study itself, or did you read a news article that summarized it? Did you consider the experimental setup, the stats run, the controls? If you didn't, I encourage you to do so before you try to repost/share it. You're likely just pinging secondary information written in a way that supports a particular stance around in your own personal belief bubble.
Masks alone are NOT a cure-all for this situation. We need to continue to practice very strong social distancing and limited contact with other people. We need strong(er) testing. We need better science-backed guidance and policies, especially from the federal level. And then, yes, on top of all of THAT, we would most likely benefit from a wider overall acceptance and proper use of masks by the general public.
But if mask mandates push more people into the fringes of improper/no use (coupled with their regular activities), then the whole idea backfires. We're going to need to monitor and adjust guidance and education as time goes on with this thing.
Here ends my rant.