Back in MoP, there was a trinket (I think it was the "Lei Shen's final Order" from Will of the Emperor) that was so good for frost DKs that the LFR version was better than not only every single other Normal mode trinket (besides the normal mode version of itself) but was ALSO better than all but one heroic trinket.
If ToT, and SoO after that, only provided a marginal increase to stats in gear, people probably would have been using the heroic form of Lei Shen's Final Order until the end of the expansion.