Vokal,
When they made their changes in 5.3 to scale PvE gear down and up the baseline resilience, they intentionally ignored World PvP. They did so because they said it was impossible to balance mainly due to the fact that the numbers will always be off in any real WPvP confrontation (plus there could be so real complications on outdoor fights like the Sha of Anger, etc.).
You can try and argue that the same imbalance will occur in a BG (and you have), but that's not nearly the same thing. If you leave two people to guard LM in AB and your opponent attack with five, that means your opponents are outnumbers somewhere else in the same restricted space because you both started with the same, small number of people. This same environment doesn't exist in WPvP because most servers have an imbalanced faction ratio, and CRZ only applies in pre-MOP zones where most World PvP consists of ganking.
So while you might argue that "because Ghostcrawler said so" doesn't prove my argument, I believe it does. When the developers of the game intentionally ignore one small part of PvP to concentrate on the much bigger aspects, Instanced PvP, that speak volumes. Their decision might be wrong, but it doesn't change why they made their decision. But again, I go back to the fact that they can't even balance around scaled down items in a 3v3 environment with certain abilities disabled, balancing for infinite combinations of people using all abilities, all world buffs and throw in outside mobs is much, much harder and I'm confused how you can argue otherwise.