Here is the main and major issue with putting tier gear into LFR. But having too many ways to gear up and "Complete the game" you essentially cut the time needed to "Complete the game" in half. There are people, no doubt, who think having full LFR gear is beating the game. And now, you are just making it easy and fast again. That is bad, it burns people out, and it's going to burn people out again.
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You see that bolded section? THAT IS FLEX RAIDING, IN WOD IT IS CALLED NORMAL