Big pulls with Dark Knight.

[Recon1o6]

Its not squishy, its that paladin has clemency, you said it yourself. 2/3 clemencies are a new hp bar. In addition, PLD has the most defence of every job and an auto block that negates 20% of damage whereas DRK lost its parry rate buffs

Clemency is so powerful that a paladin can solo duties every other job in the game cannot purely because of that one skill

Drk is also the only tank without a reliable self heal. GNB has aurora, WAR has a self cure and bloodbath nascent flash and lots of aoes
Drk's always been more suited to tanking bosses, TBN is fantastic as it just flat out breaks tankbusters and its valuable for saving folks that just got rezzed or vuln stacks.