That's the past. Death Knights, as you know, start playing open world content at about level 60.
I don't play WOW, but is there an option for Death Knights to start at level 1? For example, a new player might wanna be a Death Knight, but may not want to skip all the early content.
No there is no option for a death knight to start at level 1. You cannot, however, be a death knight until you have leveled another character to at least 55.
So for a new player to create a Death Knight, he still has to go through 55 levels with another character, and therefore gets to see the old world content still.
If all else fails, lower your standards.