Amid the masses of melee and healers in FFXI, the game suffers a serious lack of jobs that were able to tank and do it well. Paladin remains the only job sincerely designed with this position in mind at all levels and most situations.
On the whole, even the best tanking Ninjas, (and even those geared in a damage-dealer build), found it extremely costly in both the ways of gil and nerve damage to squeeze every ounce of enmity they could out of the job to force it to do things it just wasn't made to do.
The release of Treasures of Aht Urghan seemed to be Squeenix's answer to anyone attempting to play NIN as tank OR damage-dealer, given both the Colibri and Heraldic Imp's high resistance to magic attack, in which the Ninja's Ni elemental wheel, (50% of their DoT), is rendered ineffective and inefficient. While some updates nerfed DoT of various melee jobs, ToAU gimped NIN altogether.
What I want to see in FFXIV are jobs that aren't useless where others prosper in a gap as large as 20 levels. Whatever in XIV will determine job advancement and progression, (EXP points, abilities and skills, etc.), all job classes should be designed with the dynamics of necessity and effectiveness at all levels in classic situations. Why should a Beastmaster or Black Mage be forced to solo or manaburn their levels? Because they can?, or because they have been given little choice?