Actually, what you fail to understand is that 'balance' between specs should mean that everyone can do roughly the same damage regardless of what they choose to play (as a damage spec ofc) assuming the fight isint to harsh on the mechanics.
http://simulationcraft.org/510/Raid_T14H.html
To use that link as an example, in an ideal situation as that is ofc based on a patchwerk encounter (assuming simcraft was actually 100% accurate which it isint), the 'balanced' specs would be anything between 110 - 120k dps, anything outside of that is for the most part overtuned and does need nerfing down to that level. The problem with fire was that it was actually doing better according to Wol / Raidbot and so needed toning down, for the most part i agree the nerf was very abrupt and dirty, did it bring fire down to a reasonable level, yes. Do i believe arcane / affliction / frost need to be brought down, yes. You guys just got bitch slapped first,