Need to address the Eureka in the room.

[Alucard135]

The thing is that, in most MMO, leveling an alt means leveling a different character, thus, going back to 0 and having all quests available again. For FFXIV to do that, it would have to multiply its quest amount by an absurd number...or create the New Game+ mode.

Oh yeah, I forgot about new game+ feature they announced. If it retains the EXP I might get encouraged to level up more characters lol.