As we have 6 races I think they should have unique abilities for each of themselves like in the description when you create a character there's a description about the races traits and lore but in game only visuals differ, so I think adding racial skill tree will further add twist in the game as each player have different taste in how they want to develop their character in game. The class skill tree only give you different skill effect with chaos points but still the same skill set, unlike with racial skill tree with limited points to alocate, the player can have unique skill set of his own since not all will want the same things.