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You're still assuming aliens would be, well... alien. I'm not saying it is a terrible assumption but our experience suggests the opposite isn't a terrible assumption either.
Carbon-based energy cycles (making and breaking those bonds) line up nicely with the amount of environmental energy available from our class of star and our rough orbit (as opposed to, say, silicon). Molecule handedness may be equally necessary.
All I'm pointing to is this particular SF trope may just as easily turn out to be more natural law than SF fallacy.
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