Originally Posted by
Mace
They don't necessarily have to big in the society, it's how often they show up in the story of the race and related to the race.
Demon hunters always show up in the story of night elves, they are there all through War of the Ancients when we follow Illidan's exploits, they are there with Azshara, Tyrande, Malfurion, they are there in WC3 through Illidan alongside the druids through Malfriuon, and the priests through Tyrande - night elf story.
While like Highborne they aren't shown in classic as part of the Darnassians, they do show up as night elven groups of their own. In Cata when we see them they are mostly night elves helping in night elf areas as well as a few others. It's the same with the mage orders too, they are shown and written extensively about, but aren't part of the playable group for Wc3 and the first instalment of classic, some of them joining in Cata
The point is they are mainly part of that story so you can't really say they have no involvement.
And I'm not saying the illidari belong to the night elves, it's just part of that group strongly, so likely night elf stories and femon hunter developments are going to show up a lot more amongst the night elves, just like druid involvement tends to, and anything pre-sundering or Highborne related - including Nightborne is all tied to kaldorei stuff because it's part of it, just like void lves are part of the Thalassian story and the development of the high elves though they are their own group.
Death knight are part of the undead story, a different faction from the forsaken, but related to that part of the story, when you deal with DKs you are going to be dealing with undeath stuff, the Lich king, necromancy etc, just like Demon hunters is going to involve demons and night elves, fel , the legion and the kaldorei.