Everything is scripted. Your class, the classes you face, everything is scripted. The BG's the Arenas.... all the same, in some case for several years already. Scripted classes and specs clash in scripted locations...
There really isn't much difference.
Truth of the matters.....
There are 2 key elements which makes a certain group of players butt-hurt now.
1. The ones that used the pathetically easy possibility to gear up in BGs and use that gear to get into current tier raiding... Not gonna happen anymore...
2. The ones that don't agree with the other large group of PVP'ers who claim for years that gear shouldn't matter in PVP. It's a step in the right direction.
For all it needs is to wait and see how it develops.