[Omgwtfbbqkitten]

RNG/NIN is sensible for the +Ranged Accuracy /NIN provides, but it comes to the point where after RNG gets its second Accuracy Bonus trait that /NIN starts to be superflous. RNGs could actually stay /WAR from level 30 and suffer little in regards to accuracy, while the urban legend is that /WAR isn't good until 70.

No, having a full on STR/Attack build on RNG isn't that great until 70. When you hit 70, RNG gets its fourth and final Accuracy Bonus trait and that's really what puts RNG to the point they can drop some ranged accuracy gear and add in STR/Attack. But Alla RNGs will still claim /WAR isn't good til 70+

Some CORs will argue /NIN is good because like RNG, they use guns and those Archers/Trailers knive/kukri. /RNG would have trumped anything Archer's knives would have provided. Trailer's Kukri x2 would only slightly outmatch /RNG's two Accuracy Bonus traits, but here's the thing, COR/RNG with one Trailer's Kukri will always have more Ranged Accuracy than COR/NIN because COR doesn't have any native Accuracy Bonus traits. COR could only gain such traits through /RNG, /DNC and /DRG.

So while RNG/NIN has some weight to it, being that it gives the best possible accuracy via Dual Wield, the "monkey-see/monkey-do" approach to /NIN on COR doesn't succeed nearly as well as some would like to believe. Funnier still is some CORs try to ape the STR/Attack builds of RNG as /NIN. Doesn't work the same. Works out a little better if you /DNC or /RNG, but only by a slight margin compared to how it pans out for RNG main, even if we're talking just RNG/NIN.

I'd argue only a handful of any job Dual Wields for stat bonuses. RNG might, COR tries to, it works out all right for WAR and DNC, but when you start moving into two-hander jobs, the intent behind /NIN becomes increasingly clear and all the more shallow.

They all do it for Utsusemi.

Would giving Dual Wield to other jobs change anything?

I seriously doubt it. People will sub /NIN in meritpo and some not even having the sub fully levelled.