Does anyone know why Naggoroth is written the way it is? Like I mean in terms of being just one big polity. Why is it that the Dark Elves a playable army have only one real rival in the High Elves?
The only thing I remember being said about the Dark Elves is that there are always enough that they are a real threat to the HElves and that their realm is stable because it needs to be to be that. And that we should stop asking questions about logistics and realism in a Fantasy Game. Dont know exactly where/when this came from, but I think it was mentioned and possibly linked somewhere in the dead Helf Quest where we played as Phoenix King.
As to other neighbors? Boney already mentioned that they dont need them to have an excuse to fight just about anyone anywhere.
For a more Watsonian reason the whole region is more or less northern Canada. Meaning the weather goes from cold to really cold to frozen. Theres nothing really growing there and the whole region is more or less overrun with monsters. I mean besides the Delves. Its where they get all the monsters in their armylist from. So its all wilderness that contains at least numerous beastmen, manticores and whatever crawls out of all these entrances to the underworld sea.
They also border the chaoswaste. From where they get constant low to high level raiding, hence all those watchtowers were not getting in Warhammer Total War.
All in all its a mixture of they dont need to for it to be possible to use them, theres just no reason for anyone else to be there and they are just one of the most atrociously written races there are in Warhammer (note that they are my second favorite race just behind vampire counts).
Dont get me started on we sustain a large enough population to credibly threaten Ulthuan while only maintaining exactly seven cities that somehow sustain themselves only from raiding while also constantly backstabbing ourselves.
TLDR: Theyre basically build on plot convenience and liberal handwaving and I am salty about bad worldbuilding