Maybe they didn't want it to be confused with the actual Demon Soul artifact.
Maybe they didn't want it to be confused with the actual Demon Soul artifact.
A better question is why does Thrall and everyone else in 4.3 call the Demon soul the Dragon Soul when the name was changed 10,000 years ago and has been that way ever since.
The answer of course is Blizz is retarded with there own lore and forgot they had several books and quests on the subject EVEN cata quests. They just need to have a lore guy whose whole job is to sit at the table and kick Metzen in the shin every time he forgets something.
The situation you're referring to regarding "Death Coil" was actually the other way around. Death Knights had the ability Death Coil all the way back in Warcraft 3. I imagine at the time they introduced the Warlock version, they weren't expecting to have Death Knights as a playable class in the future, but when they did them having the ability Death Coil similar to the WC3 was a 'must-have.' Which is probably why they have since changed the name of the Warlock spell to "Mortal Coil."
The correct answer has already been given but people still keep weighing in with speculation ... Demon Soul was tied to our demons; now it's not tied to our demons, so it didn't make sense to call it "Demon" Soul anymore.
I am the one who knocks ... because I need your permission to enter.
We don't allow discussion of religion here so I'm just going to close this.