I think since February we’ve learned more and more that people without symptoms are contagious. The only way to follow Fauci’s advice in that case is to wear a mask because we don’t know if we have the virus or not.
See this email from a government doctor on Feb 23: https://www.nytimes.com/2020/04/11/us/politics/coronavirus-r...
https://static01.nyt.com/images/2020/04/11/us/politics/11dc-...