We understand that covid is causing scarring on the lungs heart and kidneys and other organs, in some cases. This would reduce function of those organs, and that reduction may not impact people until they are older. That's why it's too soon to declare it for covid in any individual case. Vaccines work differently, if they caused such scarring for example, it would be accompanied by a bunch of other symptoms which would have been spotted and tested. As a result you can't point to something like I have for covid and make the same argument. Yet, we do understand the vaccine protects us from covid, so we can make an argument about it being a net positive overall.