Good science tests assumptions. Even if the result often ends up unsurprising it is important to test assumptions as else we never find out which ones are wrong

Good science tests assumptions. Even if the result often ends up unsurprising it is important to test assumptions as else we never find out which ones are wrong. There were a number of cases of individuals being infected a second time after covid recovery. This article corroborates the evidence that individuals that had covid might have a low chance of reinfection and therefore might not need a vaccine. If you look at some other comments here you will see that still the evidence is not 100% clear cut, so good that data analysis continues in the future, e.g. to see if there are differences in how long the effect lasts between different kinds of vaccines and natural infection (there is also more than one way to have covid).