No, it's not just a case of the obvious being stated. In a discussion of DK design in arenas, Dr. Street comments to clarify the intended role of death knights
in arena and other factors. He also makes a good point about the forums in general that bears repeating for emphasis.
"We don't intend for these forums to be the primary way the team communicates our vision for the game and upcoming changes to the community. You'll get a little of that on a few select subjects through the forums and sadly that's all you're ever going to get. It's not that we don't care. It's that forums are not a great medium for that kind of mass communication. I wish sometimes you guys could be satisfied with the fact that we used to not communicate at all and now are able to communicate a little."
Moving on to the specific issue at hand in this thread, the discussion is the old shadow/frost spec that turned the death knight into a much more ranged caster, generating runic power quickly and then converting that runic power into Death Coils at range. It wasn't intended for the class. They have no problem with Death Coil itself being a popular attack, as long as the death knight has to put an effort into staying in melee with its attendant disadvantages to do so.
"The DK that runs around and does nothing but Icy Touch or Howling Blast or Death Coil feels like a rogue who forgoes combo points and openers and everything just to spam Fan of Knives and nothing else."
It's interesting to see players managing to find ways to bend the class out of the original design intent and how Blizzard responds to that: specs like shadow/frost or diseaseless blood DPS were adjusted quickly to put the class back to where Blizzard intended it.