Anyone know if blocking mitigation has been increased from 20%?

[RadicalPesto]

This is incorrect. Passage of Arms also gives you 100% block for 18 seconds.

Passage of Arms should absolutely never be used as a personal mitigation cooldown, much less for a whole 18 seconds. Passage of Arms is a group mitigation button that you weave between your rotation because the party defense effect (but not the block) lingers for about 5 seconds after being applied.

And no one in their right mind would ever use Passage of Arms for a full duration or even longer than 2 seconds for self mitigation, the fact that you mention in it is laughable. It is not a personal CD, and never will be. It is simply there just like cover and clemency, racking up dust only to rarely ever be used. No Warrior would ever trade equilibrium for clemency and theres a reason for that. niche ability that rarely gets used vs a self heal that can be used whenever, wherever and never loses its purpose.

You're correct in PoA being practically unusable for personal mitigation, but ever since patch 4.4, the effects of channeled aoe defensive skills such as PoA and Collective Unconscious occur immediately and linger on for a few seconds, allowing you to instantly cancel them without immediately dropping the effect (for PoA this only affects the party mitigation buff, the block disappears the second you cancel the animation), meaning that Passage of Arms is a lot less niche than it used to be, being quite useful in any situations where the party will be stacked together for group damage, with the only difficulty being making sure you're positioned correctly, and that you don't press it too early. After you use it you can just cancel it with your next gcd.