Paladin, Gunbreaker, and Warrior are all evolving as jobs. Dark Knight is just stagnating or just getting worse with each expansion.

TBN - Factor in HP squish and TBN is objectively better or worse based on less total HP means weaker shield. Bad for mitigation but good for likelihood it will break for one free Flood or Edge. Currently Tanks have over 100k, if the stat squish and Media Tour is anything go by you are looking at what 65k HP at 90?

So that 25% shield goes from 25k damage shield to 16.2k. Big OOF considering DRK has little to no HP sustain.

15 second recast. Costs 3k MP.

Holy Sheltron - Blocks attacks for 8 seconds, 4s of 15% reduced damage that will stack with block so probably 30% mitigation for 4s, gives you a 250 potency regen over 10 seconds.

5 second recast. Cost 50 Oath gauge.

Bloodwhetting - 10% reduced damage for 8s, additional mitigation of 10% so 20% stacked, weaponskills heal for 400 potency each for 8s so 4 weaponskills therefore 1200 heal potency, 400 potency damage shield.

Heart of Corundum - 15% mitigation 8s, 15% additional mitigation for 4s so effectively 30% mitigation, Excog effect if you reach 50% HP or effect expires so you get a big heal.

I dunno man looks like these TBN successors are leagues better then the original.

And that's just a comparison for just the TBN type skills.