Searching for a general opinion on this, since you will see these two point taken in close to all arcane mages speccs,
but if you think the 2 points in Nether Vortex is worth it or not. (Gives your Arcane Blast 100% to apply slow)
This considering that all of the 4 tanking classes have and should be applying the debuff to activate the 6% dmg increase in the Torment the Weak.
(Paladin being the only "one target only" by Judgement)
Warriors: Thunder Clap
Paladins: Judgements of the Just
Druids: Infected Wounds
Death Knight: Icy Touch
The rotations/priority of the actual spell applying ofc differ some between the classes, but should be up independent of class within 5sec of the encounter.
I would like you to not take into account that the two talents could be of benifit while doing dailys, farming, pvping or w/e.
Only consider a pure raiding specc, were those 2 points may be dropped into Improved Blink/Prismatic Cloak/Improved Arcane Explosion or even Fire Power for example, and imagine a fight like ragnaros hc.
Or do you sleep better at night when you're 100% sure that your 2nd AB will land on target with 6% dmg increase.
Im greatful for all your thoughts and input.