you have too to make a valid point as samurai as tank, you know? you argue and all, but give me a reason of why the samurai must be a tank?
because samurai = warrior in terms of tank type...
please tell me why the samurai must be a tank, because in the old FF they can use a shield or heavy armor? forgetting that the samurai don't use shield nor really wear heavy armor.
your only argument is: "dark knight was used to be a dps in old ff now they are a tank"
why add a new dps and not a tank? because dps deal damage, they don't deal with mechanic like tank and healer.... a tank jobs is to get aggros while surviving, nothing more nothing less... they are tie by this. all them gameplay work around this.
a dps is only dealing damage, meaning they can focus on different gameplay, Yoshida himself have said in the past that they don't add a jobs if it don't bring something to group, nor to the game... making tank redundant like the samurai, that will have almost no difference with the warrior.... is idiot. it will bring nothing new, nothing to the group.
Samurai is specialized into parry and counter for them defense, both are already covered by the warrior.
Samurai is specialized into physical damage for them offense, still covered by the warrior.
Samurai is an offensive jobs, is not one that can endure tons of damage, it's one that focus on kill fast them enemy, still something a warrior do.
if you don't understand this point, i can't help you, the only difference between samurai and warrior in terms of gameplay will be how they attack, in terms of type they are potentially the same. worst, dark knight and samurai both will use two handed blade.
what can do a samurai as dps? bring new mechanic based on technique, this new mechanic as tank will not be able to offer new experience outside how you attack. as dps they can offer more possibility.... the dps is not tie to the fight and them mechanic, but only on dealing damage. it's easier for them to add a jobs that will deal damage than a jobs that will tank or heal. since they avoid to make a jobs redundant!