This statement assumes the only bad outcome from COVID is death.
Death is useful as a metric because, unlike other health outcomes, particularly quality of life ones, there's no element of subjectivity.
Personally I am not convinced that the young and heathy need to treat COVID specially. This is a pandemic of the old and unhealthy more than anything.
Polio was lethal in less than 1% of cases, and caused severe disability in a small fraction, too. Yet people didn't go into hysterics when asked to make a relatively larger sacrifice (the polio vaccine was far less safe than modern ones) for their country.