If there is any requirement for pilots, i sure would love to see the required safety case. As mentioned above there are safety issues that have to be dealt with, like how easy is a pilot with mask understood? What to do in the case of smoke, fumes, fire, loss of pressurization? Will there be any issue at high altitudes (remember, no requirement in EASAland for one to wear a mask above a certain altitude) and TUC? And of course, how often to change the mask, which kind of mask (N95/99). And of course, how does that impede on biological requirements (drinks, food). Not to mention, the nuisance of unlocking the iPad with a code instead of just looking at it.Of course, during briefing time it could be somewhat sensible, during flight operation? I seriously doubt it.