That does seem to be different from what you've been saying. You've been saying that you were skeptical that the viral load is sufficient to infect people. But nevertheless, I'll accept this.
So with that said, we agree, that it's possible that an asymptomatic carrier can transmit the virus to uninfected people. Now we're down to likelihoods. Which is where I'm at. Given your numbers above, let's say we're talking about 1% of the population is infected asymptomatically/presymptomatically at a given time. It seems like a reasonable number for likely scenarios. That one person goes to work, works closely with others who are not wearing masks, and infects someone. That person then infects someone else. And so on. If mask wearing reduces the R0 such that it's less than zero (certainly not something that's been proven) the virus would eventually burn out.
That's the information I want. I want to know what the effective R0 is when x% of the population wears masks correctly. Show me that curve and I'm might jump on the mask bandwagon. If it just bumps the effective R0 down a few hundredths, like from 2.4 to 2.397. **** that. It's not a lot more than noise. I think my own methods of avoiding spread are better than that. But if it's a few decimal points, like from 2.4 to say 1.9, okay. Now I'm interested. That might equate to a lot of lives that don't have to have a bad outcome from catching this virus. It sounds to me that through all the matter-of-factly language, this may be were you're at too.
I don't think you're going to get that level of detailed evidence in short order.
Researchers are still trying to figure out why this disease appears to be spread primarily by superspreaders: one hypothesis is something like 10% of the people do 80% of the spread. They don't know if it's something about those individuals, the viral load they contract, or that they happen to be out at the timing of their infection at just the right moment.
When I look at risk/reward I look not only at likelihoods, but at the severity of each outcome. If a mask reduces the likelihood of spreading the virus, that might be a significant result including saving lives of multiple people, getting schools open etc.
If a mask doesn't reduce the likelihood of disease spread significantly, you lose nothing but your pride or a few dollars you spent on your mask or ?? some perceived evil subversive influence that I'm not finding any serious evidence for.
In my view, if a mask might be even a small contributor to reducing transmission it's a step worth taking.