or why fire requires slight inferiority to Arcane as it is now:
As it is obvious to anyone that plays end-game raiding in Arcane, the spec is not easy at all [compared to 5mans and BH]. Only if the fight is very stationary, such as being on Baleroc and and not moving that much, or in Majordomo, then it is possible to do high dps. The problem with fire being buffed directly is that it's an extremely easy spec to play. You are not positioned properly? No problem, keep running about jumping up and down while doing a scorch or two. It won't destroy your dps, after all, your Living Bomb, your Ignite, your Combustion, your Pyroblast dot, will be on the target, no much harm done. Same if you completely misposition yourself and you're called by someone to change position. No problem, just run there for even 50 yards. You will not kill your dps.
Now try this with Arcane. If you are not positioned properly, or the fight inherently has tons of movement, or if you are being interrupted - or knocked back - right after pulling cooldowns - hell - then you are destroyed. Miss a couple of arcane blasts? Hell.
Plus, Cauterize.
Fire is "technically" more complex but in reality the gameplay is plainly easier.
IF the buf gives it "equality" with Arcane, I will HAVE to go with fire since that mathematical "equality" will be in reality a clear superiority, since it will be much easier to play optimally. Let alone survive stupid mistakes.
IF the buf gives it mathematical superiority, it plainly kills that Arcane spec no questions asked, but that may be already the case.
Also, we will have problems in various guilds that have setup their 3%+ bufs etc, around their setup and this will disturb it.
I hope what this does is to give slight inferiority, so that taking fire will be on equal grounds and the choice would be based on what is fun or more optimal for a raid buf's.