DY, not just koron, but CORON OHR … don’t need no Torah codes, the peshat is here
nisht: do not make up your own reasons.
these are not my reasons, I think most commentaries say it is to not embarrass others or not to make them used to it (Chizkuni), or make it posibble for people to come for judgment.
Moshe was wearing it all the time, except when teaching (Ohr HaChaim, Behor Shor) or only when communicating with Hashem, (Kli Yakar, Tur HaAroch) or both (Rashi, Rashbam, R Bahya). This seems like an argument for those who want to teach without masks, as student needs to see teacher’s face (Seforno, Chizkuni, Eruvin 13: R Yehuda being zoche “seeing back of R Meir”).
Moshe retained the rays for his whole life (R Bahya), so he was wearing mask on and off for 40 years. So, don’t claim it is not possible.
Seems a machloket between Onkelos saying that he used more than N95, a full mask, and Yerushalmi meikel on just a one-layer cloth mask.