I literally wrote the identity in that post. Undead individuals that has been shunned by their previous societies which later created their own to have a place called home. That's their identity.
Now it gets reduced to if you are undead you are forsaken. Their identity gets reduced. It doesn't get to grow. This might turn them to a more civil and peaceful faction. Sure. Doesn't change the fact that their identity is reduced to looks rather than a society of necessity and desperation for a place to call home.
Neither Calia nor Derek fits the narrative that they are shunned by their society and is looking for a place to call home.
Derek is literally going forsaken and horde because he now looks undead regardless of already having a home.
Fairly sure most people who play Undead are doing so because they like the idea of a society created through desperation and being cast out. Which now gets deleted in 2 patches in a hamfisted way.