Say your chances of not catching CoVID sitting next to someone else in a room who has CoVID if you are both masked is .95 for every hour.
You sit there 8 hours.
.95
.95^2
.95^3
And so on
After 8 hours your odds are now only .66, approximately.
And I am using an insanely optimistic .95 number.
After a week of 8 hours, your odds of remaining uninfected are now .1285
You are much more likely to be a carrier and transmitter instead of uninfected person at this point.
The simple math is that if you are mixing with any other people regularly for an extended time, you Will catch CoVID and no mask, even the best, will prevent that.
They are pointless. They merely delay the inevitable, and as we approach herd resistance (if not immunity), that and seasonal behavior patterns will be the only things that slow it down.
Now, weigh the ultimate mathematical futility of masks against the harms and negatives, which are also very real and sometimes also cumulative.