So, probably slowpoke moment, but unable to find any extensive reasoning. Coming from Cata, we all know that MoP was designed for "take whatever you want" mentality when it comes to Demons and Talents, but there's always going to be something that does more DPS. Looking through the MoP guides, all I can ever see is that the Felhunter/Observer is the choice for Destruction and Affliction, and Felguard for Demonology. My question is: Why?
I can understand the end result, they give more DPS than the others, but I haven't found the reasoning behind it. Is it that their spells deal more damage than the others? Is it that they have an auto-attack not bound to their spells (I thought the Fel Energy was to fix the OOM issues, but might be wrong)? Is it that melee have more uptime? Or that the Silence/Stun is too useful in a PvE setting? Personally, I'd love to use other demons since I think they can be more useful (Succubus' auto CC for PvP against Rogues, Imp because he's cute, etc). I've been able to find literally zero information on this, so basically main questions to the Warlock community are:
1) Is the difference between the "optimum" Demons and the others big, or is it a case of min-maxing? Would a non-high end player need to use the "optimum" 24/7?
2) Has Fel Energy fixed the "no auto-attack" issue of the Succubus and Imp?
3) Demo question: Does the Fel-/Wrathguard give more Fury than others? Does the Fel-/Wrathguard just immediatly replace all other demons?
4) Is the Voidwalker still purely a tanking Demon? Or does he have other synergy (thinking the Disarm) to give a reason to use him in PvP
Thanks for reading.