Was not the vaccine developed to mitigate the serious negatives of an unprotected Covid infection, as opposed to preventing an infection?
As the case with vaccines, to prepare the bodies response to the target infection.
Though jabbed up fully, we also both "caught" it, but basically only knew that because we tested, not because we were seriously ill.
We only tested then as we were at an event where others were reporting being infected, and responsibly we tested as we were about to leave for a reunion with others in their eighties.