What doesn't make a lot of sense is comparing vaccines that have been around for ages (tetanus, flu) to ones that were developed like yesterday (COVID, malaria)

What doesn't make a lot of sense is comparing vaccines that have been around for ages (tetanus, flu) to ones that were developed like yesterday (COVID, malaria). I have the COVID vaccine but that doesn't mean I am not concerned about potential long-term effects that we know nothing about. That, and the possibility of original antigenic sin [0] permanently screwing over our ability to mount an effective immune response to novel strains. What justification is there for pushing a non-sterilizing vaccine, that doesn't prevent spread, on non-vulnerable populations? [0] https://en.wikipedia.org/wiki/Original_antigenic_sin https://en.wikipedia.org/wiki/Original_antigenic_sin