I know, Im spamming a little today but things either occur to me, or annoy me.
In this case, its the latter. I’m actually working on this character, who is now level 75, and she has 3 world quests that all award the same item
And the item is a trinket which is - wait for it - unique-equipped. Why, Blizzard? Why would you put the very same item, which can’t be used more than once, on the three world quests, effectively making them useless?
It just seems so damned … stupid. 
Doesn’t thr reward change after you have the gear from it? I feel like at some point all my WQ become gold/rep.
Protip, you can change the rewards of WQs by changing your spec or doing it a few hours later after the zone resets.
No. I got one of them and the other two were still there.
You can always just do the WQ for the exp and vendor/DE the duplicate. Not totally useless, just less than optimal. While leveling gear doesn’t matter anyway. 
Yes, and yes. That doesn’t invalidate my point, which is that offering the same reward 3 times is silly. Would you feel the same if they did it more often, on higher level activities? “Oh, just give them all the same items on those cache rewards, they won’t complain, will they?” Its the principle I’m talking about, the lazy game design.