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WoW is a complete different can of worm, tanks have more utility like debuff cleansing, battle res, dodge (sometimes 100%) and but let's do it:
-"Tank durability can cause some other problems as well, especially in challenging endgame content" this is a completely different situation from XIV.
-In War Within tank sustain is much higher than XIV. There's literally a tank that can't die in their savage equivalent, outside of instant KO. If you complained about WAR being immortal, Blood Death Knight is truly immortal in any content.
-"They sustain the group, dispel harmful effects, and respond to burst damage", healers have more responsibility than watching healthbar.
-WoW Tanks can heal much more than XIV's, if you complained here I'd agree, thought it's the previous expansion i've seen numbers from tanks doing 80% of a healer.
There's quite a large problem with your analog here.