I think it would be cool for a random gear re-roll for raid rewards if you didn't like what you got. You could limit it to a one re-roll, it just sucks when you grind out the HAAT and you get gear you don't need.
They could just give more guild currency (or a different type) and let us save and buy from a selection of raid only gear. Limit the appearance of certain pieces like they do currently and let us decide, make it a no refresh store (or costly in the store currency)
I like the reward system they have, it's like Christmas morning, the anticipation, but gear that you get from daily challenges should not be included, that's why I like the re-roll idea, at least it gives me a chance a something different.
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They could just give more guild currency (or a different type) and let us save and buy from a selection of raid only gear. Limit the appearance of certain pieces like they do currently and let us decide, make it a no refresh store (or costly in the store currency)