I'm almost certain it's been stated that they unlock at whatever rank the class is, but I can't find it for the life of me. . .
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job specific weapons would work if they make the weapons unique and awesome.
This will make me quite sad. There is no reason that a specific class should be required for a specific job. I can understand making the level of a job equal to the level of the class in order to prevent people from needing to level both jobs and classes. However they could simply have jobs be a title and the level based off of the current weapon. This seems like SE is taking a shortcut by squeezing jobs into the class system, which might be faster, but provides no benefits over a title system and a lot of consequences.
for a description of a title system. Titles/jobs are unlocked after a class has reached a certain level. It can then be assigned in addition to your current class/weapon, thereby restricting skill equipable but providing other benefits and abilities. people can then look at the combined job/weapon to determine expected party roles.
The original design of the system was that we would not have levelling, but only skillups. In this context, tying weapons to "classes" makes perfect sense.
The addition of physical level to the design just confused the issue, as did linking hitpoints and spell points to current class.