90 on one character isn't game breaking lets new get to real content and lets old players reroll if they want. I wouldn't be upset if they add a increased start level based on number of characters. You ignore the story second or third time round, so 3rd character past 70 any new characters start as a lol 70. It's just a more developed death knight model across all classes. One issue I will say is to do 90 voids mop work so it should of been 85 so new players play a little of the old expansion still and close enough to catch up to friends