Yeah, Mike seems to be misremembering the original game. Ironically he does later go on to say the Japanese PS2 re-release was called the “Zodiac Job System,” but only cites “increased movement speed” and a “trial mode” as its additions. Did the title of the game not give it away?
In any case, the Job System is as follows. When you get a new party member, you have to assign a job to them. This job’s really just a smaller license board than the one in the original, with licenses that would be appropriate to such a job. In other words, you’d be able to duplicate these “jobs” in the original game (for the most part).
Multiple characters can use the same job, but you probably don’t want that because then you’d just have multiple identical characters (which was an issue many people had with the original game). Not to mention each Quickening (Limit Break) can only be unlocked by a single character.
At least, that’s what it was like in Zodiac Job System. Evidently Zodiac Age has introduced subclassing, which I’m quite excited about. But I wonder if license points have been increased as well, otherwise you could very easily be spreading yourself too thin (again, a problem in the original game).