SIVA was not sinister at it's conception. It's a self-replicating nanotechnology that was used to help build and colonize during the Golden Age. That's a far cry from an elixir used to increase mental and physical capabilities of the average person.
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Well through technological advancements humans were able to live longer and did in fact have increased physical abilities They mention this in the very beginning cutscene for the game "human lifespan tripled!"