Even if you believe "it's just the flu", that can vary. I got the flu twice in 3 years. First one, barely noticable,, second one, destroyed me and put me in bed for 2 days, couldn't get up.
COVID will hit some hard, some not hard and some destroyed
My college roomie in OKC has it. 40 years old and out of shape, but not terribly so. Said major headache. Major dry cough was the worst if it. Turned into pneumonia and that was a bitch. But he is improving as of a couple days ago.