It worked fine till omicron. It was totally fine and kicked delta ass. But there are limits how much you could beat out of the immune system with the same vaccine. It is completely surprising we even got this far but delta was not that much different virus, just had higher viral load. Omicron is totally different https://www.economist.com/science-and-technology/the-case-fo...

The fact that we can limits its transmission and reduce illness is a gift but really expecting current vaccines to do more is just too greedy.