It's a very simple answer. Bungie does not believe levels/gear should matter in PvP. They believe this with a religious fervor! They will do mental gymnastics to show they are adding level/gear advantages while at the same time actively working to negate those levels. This is what they did by limiting the level to 20+ and nerfing exotics. I think it's pretty safe to say level/gear advantages will NEVER be that great within IB. If you like the rewards play it but if not stick with the crucible. It's the same thing!