You are missing on the current rate of covid infections which is very hard to know because there's no systemic testing any more and many people are asymptomatic

You are missing on the current rate of covid infections which is very hard to know because there's no systemic testing any more and many people are asymptomatic. Last time the UK published this data in March, approximately 1 in 40 in the population tested positive and so the number of infected must be significantly higher. No other airborne pathogen is present in multiple percentages of the population. Also, the problem here is the generalization "any severe infection" -- many otherwise healthy, young people with a reasonably mild acute phase have developed debilitating long Covid symptoms.