Just how is citizenship status by virtue of birth abroad determined, if not by citizen parents? Are you trying to tell me that this is not birthright citizenship via jus sanguinis, curiosity?
And, just how is citizenship status by virtue of birth domestically determined, if not by place of birth? Are you trying to tell me that this is not birthright citizenship via jus soli?
Dust off the Clintonian Parse-O-Matic, it's is-is time again, boys and girls, lol.
I'm certain you do realize, that original intent for the Consitutional term of art natural-born citizen has not been amended, altered or otherwise enlarged in any way, since our Constitution was ratified.
Citizenship can be either jus soli or jus sanguini. It's jus soli when a child is born in the US, and jus sanguini when he's born overseas. I don't see why you find this so odd or "inelegant."