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Imagine a random individual with no knowledge of quantum immortality. Let us call that person Individual A. Individual A lives a normal life until they get old and it is the year, say, 2100. At that moment humanity discovers biological immortality and Individual A receives the treatment just in time before they die and is now immortal.
Imagine a different individual born 1 year before Individual A is born. Let us call them Individual B. Both Individual A & Individual B have an equal life-span (100 years) but since Individual B is born one year too late they die in the year 2099 and never reach immortality like Individual A does.
So there you have it, a different way of looking at normal reality that does not involve somebody having to live through every conceivable configuration of reality because of quantum consciousness.
However, to counter this argument, because of infinite parallel realities it is conceivably possible that humanity reaches biological immortality (including trial runs, economic distribution, marketability, etc.) by the year 2099 allowing both Individual A & B to live forever, theoretically.
And then to counter that argument would be the possibility that both neither Individual A & B do not live to see the full development of working biological immortality or die early on in life due to anything else. Just because it is possible does not mean that it proves that quantum consciousness/quantum immortality exists.