sure the original advise had an eye on supply. however the general advise though follows WTO guidance. some seem to want to follow other advice because that "makes sense" and find some other experts to agree its the right thing to do. it seems sensible to wear them and not make a fuss, though...
and this is why it would be daft to recommend them, let alone compulsory. its also irresponsible to redirect supplies away from those that need them for protection from persistent contact, or non-medical use such as construction. its really very easy to abide by some social distancing and not...