95% of people (which is a "vast majority") could have normal mild to moderate post-viral symptoms which go away entirely in 12 months. If 5% have long term disabilities then with something like ~100M people in the USA having been infected that would be ~5M with long term disabilities. That would be 20 times more people than were affected by Gulf War Syndrome. That amounts to a 1.5% chunk taken out of the civilian labor force participation rate.

A small minority of people having serious difficulties with the virus can turn into a large medical issue when the denominator is 1/3 to 1/2 of the country getting infected.