This wouldn't really work out if it was based solely on traditional Destiny roles. In total, there are 9 combinations of people that you can be, with human, awoken, and exo as races, and warlock, Titan, and hunter as classes. With the addition of this, only the fallen could be with the fallen subclasses, limiting customization, as humans, awoken, and exos could not partake in these new subclasses. Now if this was straying away from tradition, then the more power to you. I love this new idea, but I think it would be too hard to implement based on this. Plus, new exotics would be too tedious to make, as only 1 specific class of 1 specific race could equip it, making them very limited. I love it, not giving it have, just realism.