Quote Originally Posted by Reynhart View Post
By your explanation, MNK/NIN should have been a tank.
Enmity generating ability : Boost (Check)
Mitigation skills : B+ Evasion, A- Guard, Utsusemi from /NIN (Check)

I wonder why we haven't seen that more
All jobs were capable of a limited ability to tank once they were able to utilise Utsusemi: Ni in addition to Ichi, however, they'd not last too long because they lacked the inherent defensive skills of Evasion/Parry at a satisfactory level in addition to having gear (unless they chose to have an evasion set) that supported that role. Ninja gear in general contained Evasion/Parry/Enmity bonuses and the later gear also added +1 shadow on Ichi and Ni casts yielding 4 and 5 shadows respectively as opposed to the 3 and 4 originally (3 for Ni if subbed by any other job).

Additionally, you're conveniently forgetting the original point of those defensive abilities have to be backed up by solid Enmity generation where Monk, Corsair, and Puppermaster fall short. I'll give you Thief because people have successfully used it to tank content such as mini-bosses in Sky with full evasion sets but it generally lacks the gear to support such a role without sacrificing it's primary DD role.