that's still better than not doing anything. basic physics.
That isn't actually true, and what you think is basic physics is actually just wild assumption. There is a reason these things are studied instead of experts just going "duh, it's basic physics."
Is 80% not a lot nowadays?
Also, when did what is the cut off for something NOT working. Im assuminy it must be at least 95%, since you didn't critise N95 masks. Well, at least for you. I've definitely heard 95% means it doesn't work from antivaxxers. So their rates is higher
It's entirely possible for there to be a situation where 80% is insignificant and 95% is significant. You can have a situation with a certain threshold where probability of something happening spikes, like the probability of an outbreak given levels of immunity in the total population where 95% immunity to measles is solid and 80% is nearly guaranteed outbreaks. Most things in biology are not simple linear relationships, it is entirely possible to have a virus where everyone in 95% effective masks eradicates it while everyone in 80% effective masks still leads to pandemic.
But that's all beside the point, because 80% is not a real number, 20% is more likely. 80% is the best they've managed to make out of cloth, using specific kinds of cloth in multiple layers. That does not apply to all cloth masks, as studies have had all sorts of mixed results. One I saw showed cottom masks being worse than strapping a regular paper towel to your face/ Some studies found masks of certain materials actually disseminate saliva particles further in smaller droplets, potentially leading to more infection. And basically all tests have tested the effectiveness of clean masks that haven't been worn for 8 hours that day and aren't already saturated with spit. Another study I saw measured particles released into the air given several different behaviors, and most of the mask options, especially the cloth one, increased to release of particles when people moved their head around or walked, which is to say those particles that may be blocked when talking or coughing could just be getting spread out over a larger area more slowly. You know, a well regulated flow rate for crop-dusting everywhere you go.
Does any of that mean that masks do or do not work? No. I'm speculating possibilities, with no more real value than seanchaidh saying it's basic physics. That's why we study things to see if they work, and the most significant study on mask usage leads to the conclusion that people should be getting disposable surgical masks, cause the cloth ones we've all be using offer no guarantee of any benefit whatsoever with regards to covid19.
And yet I'm the only person you deemed it appropriate to correct.
Because you were the last statement made, and have the "disagree with Phoenix" part covered pretty well.