IR didn't exist before SB. That aside, it doesn't sound as complicated on paper but warrior's rotation, particularly its burst rotation, was never as complex or satisfying as it was in 2.0 and it would be impossible to convey why to you when you didn't get to experience it yourself. Suffice to say the loss of Fracture and the addition of Deliverance did a lot to reduce how much you had to think about using Defiance whereas before HW Defiance had more uses than just Unga bunga give hate.
Also my replies are in direct response to the assertatiom that Defiance was merely an ogcd you used to eat tank busters or pull the boss with, which is in fact false. What I've been describing is what the OP meant by "knowing when to move in and out of Defiance". Asking what it has to do with tank enmity generation is irrelevant, however as little enmity has mattered in the past it does mean even less now.
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