The current vaccination protects you only until new variants arise, then the training that your previous vaccination gave your immune system becomes a liability as your immune system switches from protecting you to increasing your risk from the disease.
Your only way to protect yourself is to dutifully get your next "updated" booster shot to protect you for next few short months. You become a permanent drug dependent vaccine customer. And you better hope next year's formulation doesn't get it wrong. And you better hope that updates can keep you safe indefinitely because there's also the risk that updates will get less effective as the bad training from previous boosters begins to add up.