It baffles me how people can think that ROG/NIN competing with MNK and DRG for STR gear is unfair or corrupts the balance of gear pools. Does everyone just choose to forget that there is already another ranged class in the making? We haven't heard much on it because it isn't ready to be talked about yet, or as much has been stated. What happens if you make NIN a DEX class and then your other ranged class comes out? That would put DEX classes at 3 rather than STR classes at 3. Do you think they'll make that class INT or some other ridiculous work around? No, it will be DEX, because it's a ranged class.
This "problem" with having too many classes lotting on certain stats isn't even a reasonable argument. Every fight in this game is balanced so that you can clear it with 2 tanks, 4 dps, and 2 healers. In the duty finder you have a limited amount of DPS classes, but there is always the chance you could get 4 mnks, or 4 drg, or 3 mnks and 1 brd, etc etc for however many combinations lotting on the same type of gear. So adding NIN to the pool of STR doesn't change anything. You still have the same chance of competing with other jobs for gear. If you're making pre-made groups you can further limit what jobs you want to join, so I feel this is a moot point. As this game gets older, with more and more classes coming out, it's inevitable that you will see more jobs competing for certain stats, all that can be changed is the order in which it happens.
I highly doubt they will add yet another set of STR gear to be used solely by NIN, because that WOULD throw off the balance of gear pools even further. If anything, it will share MNK gear. As more sets come out there appears to be the trend of MNK wearing lighter armor while DRG has heavier plate sets. I don't see NIN fitting aesthetically with DRG but it fits just fine with MNK, which already has the eastern style Fuma set to boot, and seemingly more like it in the future.
But what about the traits, you ask? Hell if I know. Do you know how many traits are in the database in Japanese spread out all over the place? For all we know they could be already existing traits that were touched in an update and mixed around in the database as a result, or they could be related to the long awaited second ranged class that they refuse to talk about yet. Why would the development team go out of their way to complicate their own stats by giving an obviously melee class DEX, which by definition is suited for ranged classes?