I'm A Banana
Potassium-Rich
It doesn't work too well in Planescape where many Native Outsiders are from varioius outer/inner planes and most have never been to the Material Plane. Outsiders arn't really born as far as I know, they simply... are...
Since PS is my #1 setting, this is something I've dealt with at length.

(Extraplanar) does it's job well here. The problem, such as it is, is that these things are called Outsiders and not Monstrous Humanoids (extraplanar). As Outsiders, Bariaur conform to all the rules of Outsiders, and thus are expressions of the plane itself, made from nothingness. Bariaur aren't normal centaurs -- they're magical centaurs formed of the very essence of Ysgard. They are not born. They do not grow old and reproduce. They are not mortal. They are Of The Planes Themselves, as much as an elemental or Archon are.
This is vs. an Extraplanar Monstrous Humanoid, which would be a normal monstrous humanoid -- born, die, eat, sleep, mortal, mate, etc. -- who just happens to be from another plane.
The big reason it was quirky is that (Extraplanar) wasn't introduced until 3.5e. So some things that, in a PS sense, would probably be humanoids or monstrous humanoids (genasi, tieflings, aasimar, etc.) got set in stone as Outsiders at first, and remained that way going forward.
My advice for a campaign that's more true to PS cannon would be to make a lot of the races just Extraplanar. It does involve re-writing the rules a little bit (and so would be unacceptable for an Official Product), but it feels more right to say that a tiefling is born, rather than spontaneously coming into being made from the stuff of the lower planes. So the tiefling would be a humanoid (extraplanar) rather than an Outsider. The (native) subtype to me just reeks of a reach-around....those aasimar who were born and raised on the material plane would just be Humanoids (maybe with the planetouched or Good subtypes, to represent their link...most humanoids have a subtype based on their race, so this would be in line with what has come before).
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