I'll humor you, though.
Our reason for this design choice is because we feel the change Dungeon Finder brought to the game started a cascade. A cascade of events that changed the game from what it once was, to the facebook game "click and get your loot" it has become today in Warlords. It is a HARDCORE realm. That is our reason. Enabling Dungeon Finder so players can sit in Stormwind, Orgrimmar, Dalaran, wherever and queue into easy experience or loot via dungeons they likely have never actually have seen the entrance to is a problem for us. A big one. World of Warcraft's initial design was a world to be explored. The mystery of the unknown brought some sort of excitement. Now there is no unknown. The game is data-mined from the PTR servers Blizzard hosts before it is even launched. You can literally sit and click in the game to get your gear, gold, profession materials, etc.
The game used to be one of community and discovery. Now it is neither. The Dungeon Finder is the very first implementation of "accessibility" features in the game that advocated the "click, join, kill stuff, leave -- no communication at all whatsoever -- who cares if I ninja everything" mentality that is now in the game. The game's community is important to its longevity; more important than any other factor in the game, and the Dungeon Finder only serves to take away from that.
Is whispering someone from global or LFG (actually communicating here!), running to a dungeon and/or accepting a summon from other players in the group too difficult for you? It shouldn't be. It might take a little bit of extra time, but the game should encourage you to go out and do things to get what you want, instead of just clicking a couple buttons to get where and what you want.
Or are you concerned about the end-dungeon rewards from heroics? Less Emblems of Frost (note: Dungeon Finder added in patch 3.3, i.e. ICC)? I'm sorry to break it to you, but the community that is used to raiding on Ragnaros & Deathwing in ICC or ToC is already in for a rude awakening in how difficult their emblems will be to get when Normal and Heroic start sharing raid locks like they should.
The realm is labeled as HARDCORE for a reason. It is not meant to be easy. If you can't handle it, I suggest you play on a different realm or server, whichever best suits you.