This is exactly my problem with the Armoury system, the whole Class=Weapon thing would have been fine if they stuck to their guns and spent time fleshing it out and fully developing their original vision. As it is now they are moving away from that vision as fast as their little fingers can type new code, further restrictions on cross classing, removal of physical level and now Job system shoehorned in on top of it all.
Just drop Weapon=Class and make Classes actual Jobs not bound to a weapon style so we can equip a variety of weapons on that Class and then have the Jobs be advancements of that Class.
I want a DRK to be able to use Scythes, Great Swords, Great Axes, Swords etc. to be bound to a single weapon on a traditional Job is a stupid move and if the reason for it is the Armoury system then just drop it already.