The average player is awful, they'll struggle with an enrage timer. Didn't Titania have an enrage timer, she was already tough as is for the casual group. Even savage raiders are terrible, most expecting to be hard carried, so how would a casual player be able to clear Normal raids when savage raiders can barely clear EX? If you've done DT EX 2, you'll see people being dragged to the finish line of the fight because of how much babying they need. They provide barely any dps, parsing 0s, while just making everything harder for everyone else.