That's literally monk.
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just gonna list the tank archetypes (gameplay-identity, not how they actually play) have and don't have, feel free to add since it might inspire some more ideas
what we have as of now:
Pure Defense -PLD
High Health/high damage -WAR
balanced/Magic tank-DRK
What we don't have as of now:
Evasion/parry tank aka controlled RNG tank
Pet Tank
dedicated counter tank
dedicated regeneration/health steal tank
dedicated utility tank
dedicated debuffer tank
And probably for the better, as that allows a wider range of play without the need for specialization (choice moved out of combat and into menus).
If one were to consider customization as a way to increase the breadth of appeal available to a job, then it'd even then really be just a last resort after having maxed out every option by which to increase -- within coherent image -- the breadth of playstyles and aesthetics available to a given class/job.
I just wish Dark Knight more greatly felt like it had its own moments of serious soul-eating, analogous to Warrior's Cleave spam highlights, and Paladin could really make a bigger deal out of its two Oaths (and as more than just a tank stance and a not-tank-stance-with-obligatory-GCD-waste).