I can only speak for warpriest as the others have yet to come out, but I think the "problem" with how "easy" the challenge mode is for warpriest and my guess the others to come is, that the challenges are still part of the actual raid.
They cannot change things so drastically because it would make those who didn't want to do the challenges not be able to complete the raid.
So that's my guess as to why the challenge this week at least is really vanilla.
What I thought they were going to do is have a separate thing on the map that only brought you to one encounter (warpriest, golgoroth or oryx only) and then have the challenge mode totally isolated. Whatever though. I'm enjoying my 320 stuff.
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Ye but if they made it so that more enemies spawn it would make it unfair for ppl who dont want to do the challenge.