Raiders only need to have the best of the patch, they could care less regarding the source. If at the end of the expansion, the relic is the best weapon they will spend time/resources for it. People who work on relics, regardless of their player quality status (because that's a thing) invest time on them at leisure.


Relics should be on par with whatever end-game raiding gear is available, because rehearsing the same dance for x amount of time still an investment of time and resources as mindlessly doing fetch quests or repeating a resource grind ad nauseam. The availability of said power is the only thing that is debatable.


Justifying you need to have the best items to do x activity is moot when at the end of the patch installment the relic is still "the bleeding edge". If the next patch (4.2) does land us the relic, the likelihood of the relic being on par with the next raid won't be until a patch later (4.3) 3 months of "bragging rights" are just enough.