Let’s see, if one is vaccinated, he is not protected from getting Covid, only that his case will not be as severe. People who have had Covid more than once say that their second case was not as severe as the first. So vaccinations and infection create the same thing…..antibodies, and both can almost guarantee less severe Covid.
All the vaccinations I have had in my lifetime have prevented me from getting the disease it was intended for. MMR, DTP, Polio, etc…..never had a booster except for Tetanus and that’s about every 10 years. From what I remember there were very rare side effects from any of these.