That's my guess but we'll hopefully see tomorrow at the LL, they said they'd talk about it.
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Teaser trailer is up on YouTube now if anyone missed it: https://www.youtube.com/watch?v=WxBYy1uzSqI
I would guess "Limited jobs" are jobs that are neither Tank, DPS or healer.
If it is like FFXI, you will need to setup a limited number of actions you can bring in combat.
From there, I would guess, depending on how the monster actions works (ability only or stats attached to it), you can spec a BLU to be a DPS, tank or healer or hybrid of some sort.
The issue I would see is that there are not enough healing abilities used by monsters to make a full fledged healer, that I can think of.
Maybe the theme shadowbringers is not so black and white choices. Going to have make more morale choices, make sacrifices, or do bad things for the greater good.
Given XIV's track record, my theory is that limited either means "limited to what content you can take it into" or "limited to no quests/story, just open-world skill gain". I don't foresee them allowing us to gain anything more than a set number of skills & abilities, and I doubt they're going to give us enough of an arsenal to "craft your own class". I could be wrong, but I look at prior content and really can't see it being that involved.
Time to save up for pre-order of the CE Shadowbringers