Sheltron and Intervention perform functionally the same effect as TBN. The main difference is that Sheltron is a strict dps gain (vs. being a situational gain or loss).

I agree that IB is an anachronism. They should either make it dps neutral and available in Defiance while scaling down the rest of WAR's cooldown kit accordingly, or just remove the action entirely. It ends up being a case of "we want to have our cake in prog and eat it too." If you have IB available for your use on demand, the encounter design should force you to use it.