A Demon Hunter is literally just an Enhancement shaman/Death Knight without totems/runes, and with a little more fel damage.
A Destruction warlock is literally just a Fire mage with a pet, and with a little more shadow damage.
A Feral druid is literally just a Rogue with a cat form, and with a little more bleed damage.
Etc.
BE paladins are Blood Knights. Tauren paladins are Sunwalkers. The same way troll Dark Rangers may be Shadow Hunters, NE Dark Rangers Elune worshippers and so on.