This was on CNBC tonight. These comments were around the benefit of the lower level or homemade masks, scarves, etc., not N95 masks. Some of his points:
-masks are no substitute for social distancing, so best solution is to stay home and away from others.
-the masks themselves really won't help protect the people wearing them. However, masks can block up to 50% of virus droplets if you're positive, but asymptomatic (i.e. you're out in public, not realizing that you are actually a carrier spreading germs). So this is a benefit to others.
-the masks need to be well fitting. If you have to repeatedly adjust it, touching your face to do so just adds unnecessary risk.
-surgical procedure masks actually use some of the same raw material that the N95 masks use. So increased demand of surgical masks would negatively impact N95 mask availability.