Re: SNAFU
"I read a piece from a professor of engineering yesterday "
Citation welcome.
(Yes I know the idea of quoting your sources is way past its "use by" date, these days any old bloggist or "influencer" will do just fine).
Ah wait, it sounds like it may well have been a senior lecturer in engineering at Brunel University, quoted in the Telegraph?
His comments were initially directed largely at cloth face coverings, not the disposable ones once widely seen, but he then widens them out to conclude that masks in general have no statistically significant effect.