> Dr. Birx is worried that people will see masks as a substitute for other measures like social distancing, hand washing, and avoiding touching your face.

Just one point, but I have an interesting observation here:

Earlier this week I finally found some masks, and last night wore one to the grocery store for the first time. It's about a 10-minute walk each way, and I encounter 5-6 dog-walkers in that distance.

Usually the dog-walkers don't bother with social distancing, but while I was wearing the mask about half of them went out of their way to go around me.