[fxleach]

> "It turns out that leakage dominates over filtration."

That sentence does not translate to "cloth masks are useless". In comparison, a bullet-proof vest may only protect part of your body from danger but it's still better than nothing if you're being shot at.

[ekanes]

I guess if bullets could flow around the vest and then still hit you, that analogy would work.

[fxleach]

What you've basically said is that if a mask is not 100% effective it's useless. My analogy stands, just because a bullet-proof vest is not 100% effective in stopping all bullets from hitting your body, it doesn't make it useless. Some protection is better than none.