Originally Posted by
Niwashi
Judging from the original answer in that article, I don't think it was the jobs that got the re-design. It sounds like they originally intended that anyone with the expansion could enter Ishgard and only the Main Scenario continuation would be locked behind the current Main Scenario. With that plan (if that really was their original plan) they could have had the quests to unlock the jobs be in Ishgard and anyone with the expansion could go there to do them so long as they met the level 30 or so requirement.
But then at some point SE decided or realized that they could do something better, probably with the Heavensward MSQ, if they knew for certain we'd done the full 2.55 story before even entering Ishgard proper. So they added that introductory quest that leads you there and locked the city until it's done. Well, since they'd already decided the jobs were going to be headquartered in Ishgard and now the city was locked behind the 2.55 story, the jobs sort of ended up locked behind it as well.