Excuse me, English is not my native language, obviously.
Just because it gives their rewards doesn't mean it should for the amount of skill/ time/ coordination/ you name it.
IB just doesn't compare to trials or the raid in difficulty and you know that.
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Trials packages don't require wins at all. You can just as easily get 320 gear from them. And if time is one of the criteria, 4 hours in iron banner getting to rank 5 for one character is just as good as an hour in the raid.