Dark Knight... SEs way of telling speed runners..

[kyuven]

Personally I'm thinking DRK is the developer's way of telling us "In case you haven't figured it out, these classes aren't going to work the same way as their namesake predecessors. We've made this one VERY different just to get that through your heads."
Namely, people should really stop thinking of the damn things in terms of FFXI or main series FFs, and start thinking of them in terms of the Tactics games, specifically Gafgarion's version from the original Tactics.
Y'know what he had? Abilities that stole HP and MP from the enemy and restored his own. Y'know what he didn't have? Abilities that damaged him to damage others. Granted there WAS a Dark Knight job in the remake that was opened up to everyone that DID have those abilities, but the three jobs we get seem strongly based on three Guest character exclusive jobs: Astrologist/Astrologer (Orran Durai), Machinist/Engineer (Mustadio), and Dark Knight/Fell Knight (Goffard Gafgarion)

In addition, there ARE other games where the "Dark Knight" class is an actual tank class. Namely the EverQuest games and WoW. Though Death Knights probably won't work the same way Dark Knights will, EQ1+2's Shadow Knights will probably be a decent reference for how it'll work.

[Callinon]

Namely, people should really stop thinking of the damn things in terms of FFXI or main series FFs

If wishing made it so...