Most of the caster Jobs currently existing in game have origins in now dead civilisations. I think WHM is the only one still with a existing tradition in a current nation. All the others are ones we are pretty much bringing back from the dead. Short of a time travel expansion or one focused on Gridania I am not sure exactly how you would 'highlight' any of the existing caster Jobs.

That said its not really a big deal. Dragoon was the star Job in HW and beyond us seeing a lot of them around it didn't hugely impact the story beyond there being a few extra lines if you played a Dragoon.

Its worth pointing out that every Job uses Aether in their combat techniques so loosely magic is tied to every Job. This is why I use the term caster rather than magic.