Well, that's because PLD had Blocking mechanics, ON TOP of what everyone else was getting.
PLD still had passive Parry, alongside their scaling passive block.
PLD still had Rampart in addition to Shelly/Bully.
Well, given that even with the current Parry being a flat 20% Camouflage was being seen as pretty meh and in need of a little tweak in order to actually be competitive with say, Thrill of Battle (The other 90s tank specific CD)
With Parry now being down to 15% the skill is pretty garbage. Especially given that it's only a 50% Parry chance and Parry is only for physical attacks and only rolled AFTER a failed Crit (Meaning Crits and Spells ignore Parry) AND Parry chance doesn't scale with gear (So you can't even grow into the skill being a reliable parry like you could make Bulwark put you to 100% block chance).
It's just objectively a bad skill, and is pretty much just a 90s 10% DR skill which is awful (Compare this to ToB's 20% max HP and healing or Dark Mind's 20% magical DR with 60s CD)
This means that GNB has the weakest 90s CD by far, along with the weakest active mitigation skill. Their AoE mitigation got nerfed into being joint weakest with Dark Missionary.
On top of having the weakest burst of all Tanks (Which already kills it for any kind of meta comp viability)
GNB is shaping up to be the worst Tank of the expansion, by a fair margin.
