What in the world does 'Blizzard catering to casuals' have to do with Blizzard's bias to one faction? You've also got "whining," "entitlement," "increased accessibility," and 'the challenge of TBC' in your post. -1 for no actual mention of "LFR" or "LFD." Your post is an excellent example of stereotyping: inferring huge amounts of information and lumping people into categories based on superficial characteristics. You don't know who plays which faction and these days many people play both.
I recall players claiming bias as far back as Vanilla. 1-60 travel was hell for Ally. 20 minutes minimum to get to Darn compared to Zeps for Horde and a great STV hub. Also, Swamp of Sorrows had Horde guards patrolling and flagging you, yet in Dustwallow Marsh, Ally npcs weren't pvp flagged.
Ally areas were so much more detailed though. Duratar was barren compared to Elwin Forest and the Barrens had so much walking! If you were north near the goblins and died, you had a 5 minute corpse walk; 7 minute corpse walk for that damn Venture Company Mine and you rezzed right into the goblins you just killed. That was hell.