Here's a piece of information regarding the AF quests, it comes from the Letter from the Producer LIVE Part VIII Q & A Summary:

1:58:41
Q: Will we be able to clear all job quests solo?
A: In ARR, we've made it so as long as you can utilize the skills of your class/job well, then you will be able to clear the quests solo. It will also be possible to obtain your job-specific equipment solo.
However, I don't know if this applies only to the armor or if they really meant "ALL" job-specific equipment.