Earlier quoted context omitted.
> "masks don't work unless you're a trained medical professional" Putting aside the phrasing, which I take to be something like "unless you follow procedures and have new masks often etc". In the beginning this was the narrative because there was a shortage of masks, or because of plain ignorance. Masks are not perfect, but they were effective, which is why they are still mandatory in some contexts. If one can ignore…
To my knowledge, to this day, there are still exactly zero RCTs showing that masks were ever effective against COVID, and at least two major RCTs whose results indicate they are not very effective (there was no statistically significant benefit to masking). If, after two years of a world-wide pandemic, the best evidence we can put forth are low-quality observational studies which explicitly state they cannot show cau…
There are RCT for influenza and other diseases Sars (1):
https://pubmed.ncbi.nlm.nih.gov/22280120/
https://www.pnas.org/doi/10.1073/pnas.2014564118
While maybe we do not have the gold standard study, I think it was the right decision, given how little inconvenience masks have, for the much bigger benefit of reducing Covid risks.