As other people said you don't have to do carnage quest it's just a good change that allow you to do this kind of quest without having to go back and forth to a npc.
In addition carnage quest reward you for exploring the aérea which is a nice thing.
The only issue atm is that carnage quest achievement isn't accurate (and as a consequence general quest per zone achievement too) there is more carnage quest than what the achievement say so you can miss some and think you have done them all
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