Inspired by this post: What happens when a Changeling dies in the Dreaming?
So, yes, Changelings killed in the Dreaming (as opposed to just by chimerical damage in the mortal world) are killed for good, the human body dies as well. Part of the explanation is that all glamour counts as Wyrd in the Dreaming, so the character is killed on both levels.
However, why is it then enchanted mortals and other non-Changelings do not die, but are merely disenchanted and dropped somewhere in the Umbra? (This is explicitly stated in Dreams and Nightmares, p. 31.) As also stated there, yes, this might be as bad as dying for some of them, i.e. might end up getting them killed soon in some inhospitable umbral plane - but it's still way different than a simple "you're dead".
I'm not talking about whether it's fair or not in metagame terms - I simply want to understand the in-universe logic. If all glamour is Wyrd in the Dreaming, why won't a human's (vampire's, werewolf's, whosever) body end up just as dead?