Not to say you can't make both types of humans from the single stat block, but then they are only different by your numbers allocation, this way they are different natively. Finally just by saying your playing a Corellian versus a Human I can make certain assumptions about your character.
That is the problem I have variant humans, they lead to stereotypes. I prefer my races to steer away from "skill bonuses" unless it is generated by something physical and inherent to the race. If the Corellian plumber, shop clerk, and rugby player-equivalent would all share the bonus then I would be happy, but if it is a skill bonus to piloting or some such that makes very little sense for EVERY Corellian to have.