You miss an important point. Both sides may have BiS geared toons a plenty but Alliance has far more of them in the PvP areas and also more in general. I am personally full BiS and I still have a bad time because of this, so not only 2k scorers are suffering.
True balance will never be achived and we all know that. However, one can tip the scales a bit more in the Horde's favor by adding bonuses or tweaking things. That is all I am saying.
No but it is one of the most major things and one cannot deny that. For years Icecrown has been notorious for its bad BG reputation in terms of playing Horde.