Talk:Death Knight/@comment-147.229.196.5-20180816114310/@comment-45.56.46.26-20180816201537

They simply wanted to make it much more visibly obvious that it was an undead rather than a construct or whatever.

From which perspective, concerns about the chest being armored are irrelevant, since undead do not keep any vital organs in their ribcage, thus the only point of armoring it is to prevent the ribs themselves from being broken. But we can just say that the Death Knight has very strong ribs.