Hey everyone,
Just a intro here, feel free to jump to the numbered list for the TL;DR :P
As a demo lock I occasionally run into the issue of being in an setting where AOE is a DPS gain but being in melee is possible (due to mechanics mostly) Going into WoD demo locks are losing out on Metamorphosis: Void Ray which was often used as a ranged AoE filler and previously to refresh corruption (though this was removed/forgotten about in 5.4 (?) changes).
As of now, we have a 2 charge ranged AoE damage +dot in Hand of Gul'dan, a channeled AoE that is melee in hellfire and an more powerful version in Meta which is immolation aura. Not to mention we have Chaos Wave in meta which replaces HoG and retains the 2 charge system but instead of the dot, it applies a slow on the target. Typically it is a DPS loss to use chaos wave in meta in an AOE rotation due to the loss of the dot and fury generation. Last but not least as demonology we typically use the felgaurd and his GoSer counterpart for burst AoE damage using Felstorm on a 45 sec CD (requires 60 fel energy) and a 1 minute cool down for our second demon to join again.
To not be taken lightly, if the conditions are right Demo has the potential for absurd burst AoE damage that is only overshadowed by destro and afflic due to current raid designs favoring their spell/spec design. What I mean to say is I do not think that DPS numbers are what makes Demo's damage seem so poor in this current tier but rather as everyone has mentioned, the encounters are suited more to the other specs spell design. But we all knew that already.
TL;DR
The point of my post is to discuss pros/cons of current Demo AoE capabilities and thoughts or suggestions of how it can be improved going into WoD. I personally have a few suggestions, although I'm sure there are implications I have not thought through so they could be considered OP or fine as is; simply looking for some fun discussion and brainstorming by the lock community
1. Hellfire shouldn't have to be channeled. The spell currently deals damage to all enemies within range equal to damage dealt to ourselves; I do not see that it is necessary to have to continue to channel AND deal damage to us. At lower haste/gear levels we have slow ramp up on fury generation so being able to cast while the spell is toggled (just as it works in meta) would allow us to gain fury while dealing damage to ourselves (the risk for reward). Again, not sure how fury generation will scale in WoD but it would be a nice change since Aff no longer has any channeled AoE and well destro's AoE is the strongest out of our specs.
2. T16 4-set to be baseline for our AoE. Although based on RNG, I quite liked the extra damage the bonus gave us. Although I more often than not saw more CW's being casted while in meta (likely due to the big purply wave visual) I thought the bonus was a fair DPS gain that I feel was detrimental for demo to be even competitive with the other specs this tier. Since our ranged AoE is on the two charge system, it allowed us occasions to have that AoE dot from shadow flame increase our fury gen for max meta uptime.
3. Lastly, I suggest the stereotypical new AoE spell that is often thought up in these kinds of posts. I haven't really had the time to think of a really good one although I think I read someones suggestion earlier of a "shadowbolt rain of fire" or maybe even a spell that used the visual of of Glyph of Shadowbolt but increased it to 6 bolts with increased damage that would each hit a different target. This new AoE spell or any other idea would be mainly used in caster form for fury generation with a meta counterpart that isn't too OP (much like how CW is used in meta but its more advantageous to not use it in meta).
So sorry for the wall of text! I just realized how bad....
Hopefully we can get some quality discussion rather than just "Demo's AoE is fine". I'm no pro but I'm trying to learn everything I can to improve my play style so if you do think that our current AoE is fine then please explain why it is fine and what its strengths/weakness are.