In my whole life (and I'm not young anymore) I have never known or been acquainted with someone who died of the flu. And I've also never known anyone who were still completely out five months after they had the flu, unlike a couple of young friends of mine who got Covid in March. One of them (<30) couldn't do a thing until October. If my parents get the flu it's extremely likely they'll be fine in a week or two. Covid would be a completely different story.