* The vaccine is stronger than a low-viral-dose infection; you wind up with more antibodies and more T/B cell engagement, so theoretically more robust immunity
* The vaccines might be better or worse than natural infection against the variants; on the one hand your body fought a whole wild virus and so the antibodies aren't restricted to the spike protein, like in the mRNA case, so your body might be less overfit. On the other hand, the vaccines seems to producer a stronger immune response, as stated above, so that might be better if the antibodies still mostly line up?
They (usually) have something which younger generations will always struggle with (simply by the nature of not being there), which is _perspective_ on which things are important at what scales. That isn't to say they're always (or even usually) right about everything, but their opinion should at least be valued as part of the conversation.