Because even tho you don't believe it, i like to go to the npc to queue BG.
That is also part of the game, i think such things used to make the game more enjoyable, i hate every kind of the new features that new expansions brought, such as BG queue, Dungeon queue, Raid queue, and ****queue.
No offense, maybe you think im just a troll, but i am not, i really do enjoy having to go the npc so i can queue, it forces you to move, spending more time travelling the world, and the bg npc halls are filled with regular pvpers and twinks. Those who want the custom features leave pretty clear how litttle they miss those things from the old days.