Quite to the contrary, it's very meaningful. People who would not be "subject to the jurisdiction" thereof would be foreign diplomats and soldiers of an enemy army, or so was opined in Ark.
And, of course their children, as well.
I agree with ODH’s analysis, and I do not understand him to be AGREEING with the Ark decision. I certainly don’t, although I grant that the 14th Amendment is atrociously worded on this question.
Still, I do support, quixotically, efforts to amend the Constitution to end “citizenship by birth alone.” As nearly all nations do, we should accord newborns the same status held by their birth mothers at the time of birth.