I agree that it would be super confusing in the storyline if new players could start as Rogue, but keep in mind: each individual player really has his or her own storyline that exists parallel to everyone else's. In your story, you are THE Warrior of Light as well as a national hero. Technically, within each player's game, it's a somewhat self-contained story. Although I think there should be some unlock requirements, I wouldn't put it beyond SE's capabilities to make a slight change in the story/quests/etc. for a new player starting off as a rogue without doing anything to the story the rest of us have experienced up to now.

(I realize that parts of the game show you flying around the crystal with other players. But as far as I can remember, no NPC interactions acknowledge that other players are as special as you are, they're just other adventurers and friends you call to help in raids.)