Basically harmless to *most*, not all. I have two personal anecdotal examples. A 31-year old female patient of my sister’s died on the vent, no preexisting conditions or comorbidities. The second: a female friend of one of my staff, a healthy girl in her late 20s who was a distance runner, acquired COVID-19 earlier this year. She recovered, but the disease injured her lungs, and not only can she no longer run, she can’t do normal activities without using some kind of an inhaler to allow her to breathe.
Just because most skate through it doesn’t mean all do.