I'm just speculating with everyone else (also, it's 5 job abilities so 5 cross class's available).
I guess for me though, the trade off of the job stones in a balance sense (both from passive traits gained and abilities from job stones) would be to lose versatility. Allowing 5 free slots aside from the 5 job abilities I don't feel is enough of a detraction for all that you're gaining. I also don't feel that allowing all jobs(not classes) to set cure, second wind, Invigorate, blood for blood, and Chameleon helps preserve the jobs focus.
Based on what has been said by SE, I see classes as a solo/smallgroup versatile option where as jobs are Focused party roles. Ex. Warrior loses the ability to use Cure and second wind to maximize hate/tanking and damage, while passing the healing responsibilities onto the more potent WHM healer. But again that's just my personal opinion.
I found the comment by Yoshida I was looking for:
EDIT:
Despite the required classes from his example not being the actual requirement, it is clear to me he's saying that the class abilities from the sub class will be used for the job.JPGAMES.DE, Michael: Recently you mentioned combined jobs, what can you tell us about it and what jobs could that be?
Yoshida Naoki: The requirement to get these jobs is to do a job quest, but to do a job quest, there is a special requirement too. If you want to become a paladin, you need to have a class level 30 of gladiator and 15 of marauder. Then you can apply to this job quest and then, if you complete it, you can unlock that job, so it is not really like combining classes. It is more like a requirement.
For example, paladin will be a really special job for tanking. To make sure that he gets those abilities, he will need do more different quests to get those abilities. You are going to protect others, but that’s not all. You have the marauder as a background class before you become a paladin. Those kind of class abilities will be connected to the paladin job. Even if you had more classes in the past, these are not related to the paladin and can’t be used.


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