Well I remember how crappy the light leveling was when we only had the vault. In fact, even though i have done the vault a whole bunch of times I barely got the arm pieces for the first time like a month ago when i started playing the game again. I had to use the IB to make it to 30. It was always a huge risk taking the relic at 29. Rng based levelng isn't very good is what I'm trying to say. And though its not 100% rng leveling now, it still doesn't feel as rewarding in my opinion.