Thinking about it in a role-play or realism point of view... you would research what is available to you now, rather than in order to get something 1000 years from now.
If the strong reason for having eras is the display of the tech tree, then go ahead Firaxis, and make them a purely cosmetic thing.
just because the advance I expected/needed/wanted - and most important, should be possible from the sciencelevel my civ had - didn't show up in the list. Forcing me to go for another more-or-less useless advance.
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