Why are humans still split according to their home planets? They're not sub-species, it's a bit like saying Asians, Africans and Europeans are different species not different races.
Would it not be better to offer skill set templates and allow for RPing a place of origin?
Because it's important to people. And I'm pretty sure there's an IC basis for the races being separate enough to warrant division.
Also, if we're being pedantic, the Rules are entitled "Races", of which, using your real life example, people of Asian, European, and African descent are certainly considered in separate classification groups.
Literally just because Veynom decided one day that there were too many Humans in the galaxy and it would look better to split the Humans into multiple races. >.>