While it really doesn't bother me too much about PS players getting extra stuff, I do think there is a huge difference between a console exclusive game versus console exclusive content and a lot of people never make this distinction. If you are going to make a game available for both systems and charge the same amount to both systems, then both systems should have equal access to the same content. People keep using Halo as an example. PS player didn't get to play it, but they also didn't have to pay for it either. The same doesn't apply in Destiny's case. Xbox players are paying for it, but not able to play/use it.
Again, it doesn't really bother me that much, but it still seems a violation of basic principle.