One of my main beefs with the FFXIV armory system in the first place is that a particular class is forced to use this weapon or that. There should be some more spread here, people. I don't want to be forced to tank because I like using swords.
Already Mages can use shields. There's no reason to force people to use certain weapons two handed (Axes, Lances). Lances being two handed in FFT was to balance their extended range. Crossbows and guns also make a nice one handed weapon.
Class Distinction is nice and all, but forcing every tank to be a sword user or every DPS to be a axe wielder will just make it bland and boring. We need variety within the classes, but not to the point of them being indistinguishable as they are now.
We need to define classes by their abilities, not their weapons. Of course some weapons would just plain make less sense to equip on one class or another than others, and so should either require either special skills (As Equip Swords/Axes/Brawl/Lances/Bows/Guns/etc. via FFT), or incur major penalties for using them.
A white mage using a great sword or gun instead of a staff, for instance, is silly. -50% Accuracy?