Samurai

[Shippuu]

SAMs have never dual wielded in FF games outside of equipping special abilities. In fact, they usually got bonuses or special abilities that enhance their TWO HANDED prowess.

FFT/FFXI in particular:

Doesn't mean they can't change that for FFXIV. You use FFXI as an example, but they went and had Dark Knight use Scythes in FFXI, never before used by Dark Knights in a Final Fantasy outside of maybe 1 weapon that was called a scythe and classified as an Axe in game.