The question is whether a booster today will prevent more damage than it causes. In 2023, when everyone has some form of immunity already and therefore very low chance of complications, the rate of adverse events doesn't have to be very high to make it so you are probably worse off by getting the booster than not. And on top of that, there are claims that adverse events are now known to be higher than previously thought.

Unfortunately it isn't as simple as more vaccine = more healthy.