PLD Novus: Parry or DET?

[TomCatMew]

First, if parry saves you on the 1-2 ```````````n a Parry in most cases.

Yes, it is true that in a perfect run paladin use CDs correctly, and healers do their job best, most damage are negligible. The parry definitely is useless.
However, we are human but not machine. Everything could happen during the fight. More and less, Anyone may mess up in a fight. Yes, you can just wipe it till your group do a perfect run. But who knows that run probably will be your 1st clear.
(Short Story)In my group 1st T13 clear. Ninja died in megaflare in last phase( i think he was too close the ring) . And both healers didn't have swiftcast, Sch was trying to resurrection. After the earthshaker, I got the tempest wing damage, then healers should heal me up before I took the Flare Breathe. For some reasons, healers didn't heal me up in time. Sch gave me lustrate but it was too late. I took the tempest wing damage and I parried an auto-attack. I had 170 HP left, then lustrate healed me up.
If I didn't parry that auto-attack, I would die. And the akh morn would kill the Warrior. Probably we couldn't beat it.
I know it sounds ridiculous and full of rng. But it was my 1st clear.