We do. Other types of masks don't help protect the wearer but they help protect others by limiting how much of the droplets get released. Multiple studies on this. I'd feel comfortable donning an N95 while everyone else wears whatever else.

Asymptomatic isn't as prevalent but pre-symptomatic is what the big driver is. Asymptomatic means they have it and never get symptoms at all but are infected. Pre-symptomatic is the time before you start showing symptoms. Multiple studies confirm this which is why across the world masks are recommended.

Lung damage is only one facet of this virus. This virus is unique in that it attacks multiple organ systems including but not limited to the brain, heart , kidneys, and liver.