I fear a 3e style of cherry-picking the best combos coming if we allow everyone to pick all the traits they want from other races. I could see some other form of ability but still based on that race but modified a bit for the new location. Something like a dwarf not raised underground would no longer get stonecunning and darkvision, but replace it with skill focus (profession) and +1 Cha to show growing up around human shops and farms. Not- 'I want the halfling reroll ability and high elf cantrip." Other systems do this.