I understand that wearing a mask doesn't prevent the wearer (for most common masks) but instead protects other people. Should you be a carrier. It slows the spread, which is a good thing?
What is your basis for this? My understanding is that an N95 mask, worn by following the directions on the box, provides significant protection to the wearer. Also, if it has a vent for exhaling, that would suggest it is not necessarily such good protection for others.
(Compounding the confusion is that a reusable rubber respirator is also called a ‘half mask’.)