Quote Originally Posted by Xenosan View Post
tl;dr: It's not until you get your new job to 50 that you need to worry about content gated behind 2.xx content (which you'll be able to do with your newly leveled lvl50 DRK/MAC/AST)
I don't think you read what you quoted:
If you want to start leveling these jobs as soon as you enter Ishgard, you’ll be able to do so without progressing through the new (3.0) main scenario story.