You are correct. Repeated trials have all shown this— in reputable tertiary centers of excellence. No benefit whatsoever.
Next, look up the historical use for political submission of people, to include plantation slaves- by the use of masks.
Not submitting to this. Or any other “federal” mandate that is foisted on the populace. To aid in their constant need to ramp up “laws” to make us all violators.
Want more proof what this REALLY is... ? No. Read it and learn, words for the submissive proles who are all... democrats of the mobocracy:
https://thefederalist.com/2020/05/27/mandatory-masks-arent-about-safety-theyre-about-social-control/