For sake of discussion assume all infections are accidental, and everyone follows anti-infection protocols to the letter. Here are a few (but not all) states s

For sake of discussion assume all infections are accidental, and everyone follows anti-infection protocols to the letter. Here are a few (but not all) states someone can be in. A. vaccinated B. vaccinated -> natural infection -> recovered C. vaccinated -> booster D. vaccinated -> booster -> natural infection -> recovered Let's assume it was proven state D has the best efficiency against covid variants. Option D includes the booster. So boosters would always be a good idea. But even if boosters are a good idea in all cases, it is worth studying whether people in state B or C have better efficiency against covid variants. Gaining knowledge is good. It may (or may not) be a fact that state B has superior efficiency to state C.