The thing I just don't get about the new Mass Effect is why they filled your squad with all the old aliens. We had 3 games of asari/krogens/turians/solarians, the idea of setting the in an entirely new galaxy and then to have it not be focused on discovering and befriending new aliens is insane to me. Them so rigidly sticking to the old formula seems like a huge miscalculation.
Anyway, time for some BitE, aww yis
Probably because it was easy. Less new stuff you need to come up with and easier to sell. Of course that is The wirst reason to do anything.