I believe the differentiation is abilities with WOW WOTLK Classic Gold a price that affects versus ones which don't, likely for functions of downranking. So for example Raptor Strike has ranks even though it's melee because it uses varying amounts of mana. Whereas Sinister Strike only ever shows one particular position because it's a fixed cost. Well, not always. Just mana price. Rogues do not...
Spanish 
English
French
Portuguese
Deutsch
Turkish
Dutch
Italiano
Russian
Romaian
Portuguese (Brazil)
Greek
urdu