Masks may be 100% irrelevant for healthy people, but we have asymptomatic people. There is no way to ascertain who is healthy, ergo "healthy people don't need masks" is practically redundant. What am I missing?

Oh, and you want citations, sorry, my bad:

https://docs.google.com/document/d/1HLrm0pqBN_5bdyysOeoOBX4p... - 30 some citations on masks.