Every MMO in history has done that. That's why there are 10 AND 25 man raids in wow. The best shit should be the hardest to get.
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Would have been fine if hard mode raid was actually different. very little changes. Also they only advertised raids as being the hardest. Dropping hard mode in with no warning is kind of a dick move.
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Nothing changes in other MMOs either (although some do) just the difficulty.