Astrologian Job Idea

[Mimilu]

Here I don't see anything that needs other jobs you could probably beat the game with the setup we have now.
Would just be better if they did a more evolved versions of the jobs themselves and re-level for different skills

By that logic, they didn't need to add Rogue/Ninja or plan to add Dark Knight and the other hinted at classes/jobs in Heavensward either (minus fanservice) because most people already beat the game with the original, 2.0 jobs.
Its just adding another way to play the game and grind, for variety and replayability's sake.