The Reach and a few WoD games used to do XP incentive things. But ultimately I think that on the topic of basically real world ethnicities and stuff (even if the names are changed), I'm not sure that I would want it to be done that way. Like, if you want to play it you should play it, but it just seems weird to me to have people playing certain races just because there's mechanical incentive.
In addition to that, I'm perfectly fine with the fact that they chose to do a euro-centric theme, because I've seen what happens, even on the professional level, when even well-meaning people try to do a feudal Asian theme or feudal African theme or whatever else in that way, and there's like a million unfortunate implications or just absolutely yikes oversight happening.
Which isn't to say that white people shouldn't do those things or attempt those things, it's more to say that if you're gonna do it you should do it because you want to do it, and I believe the desire to do it should come with some desire to do it correctly. Which, again, I'm not saying no one here or Arx's staff wouldn't have that in mind, I'm more saying that I've encountered, both in hobby and in professional tabletop writing, a grossly high amount of people who enjoy the aesthetics and surface level aspects of cultural things, and just dive headfirst into it.
Like, you don't even have to be like "hurrhurrhurr historical accuracy, rabblerabblerabble!!!". To me, Black Panther's Wakanda is a perfectly great example of a fictional African fantasy society that goes a bit deeper than surface level "who are these mysterious brown people that do cannibalism and worship golden idols and evil gods!!!"
Incidentally, Mwangi in the original version of Pathfinder is absolutely goddamned atrocious and reading it absolutely disgusts the shit out of me. Modern Mwangi in the current Pathfinder is great though, definitely a massive improvement, but original Mwangi is the perfect example of just completely fucking up and diving into some old timey ass racism and othering of an entire fictional society set in fantasy Africa. The entire original setting is literally written from the perspective of colonizers exploring and learning about the "savages" lmao.