that limited context is when two people are facing each other, one infected, in relatively calm air, and within direct exhaust inhalation distance (~1m/3ft). yet we've been sold by the political media machine that they prevent spread everywhere, so "just wear a mask!" it's become the #1 policy prescription all over the world, because it's seen as doing something visible (political win) but not too much (more political win!).
distancing among non-household members when indoors is a much better first mitigation, but it keeps getting lumped in with masks (and the even less useful hand-washing/sanitizing) and drowned out because it's not as visibly performative. if the virus doesn't land on mucus membranes it's overwhelmingly likely to die.