Exactly... and every time you get it, you also expose yourself more and end up worse thus needing more vaccines! And media tacitly promoting that nothing could happen with the story of a german man who got 72 doses to sell the certificates and he didn't die (The fact that they are using stunts as evidence tells you how beaten up scientism is these days.)

I still don't understand why oh why are people boosting themselves with an vaccine for a virus that no longer exists. Oh it must be because those articles insisting an experiment possess no risks so why not?

Integrating the immunity curve shouldn't be too hard if we can approximate the function or I bet numerically is easier to run too. I'm interested, what does the area of a vaccine efficiency function give you? Unbounded it would give you the total amount of change in immunity but bounded as you put it?