Poetic (Ironworks) Gear

[Kuwagami]

Assuming that this is the correct order the stats are checked in, it doesn't make parry useless. It just increases the chance that you'll mitigate damage overall. (Ex; 10% chance to block + 5% chance to parry = 15% chance to mitigate damage)

that's not really true (though it may be arguing meaningless difference)

in your example, you have 10% chance to block (90% hits resulting unmitigated) then 5% chance to parry the remaining hits, which results in 4.5% effective parry rate. While it doesn't matter for low numbers, it can result in a noticeable difference later on (30% block and 35% parry results in only 24.5% effective parry rate, 54% mitigation on hits when you could expect 65%). That's the main reason why a parry build is more effective on a WAR than a PLD considering raw numbers.

Now does it really matters ? Well, not that much. After all, you're gaining more from blocking than you're losing on the alternative (parrying) so overall your mitigation improves, and is better than the one of a WAR.

general consensus is "Don't stack it but don't refuse it either".

Parry > skill speed

You wouldn't want Parry either, to be fair. Crit/Det/Acc, Det/Crit, Det/Acc, or Crit/Acc.

yeah of course. But if for some reason you're not going to put accuracy on it (considering the poor's novus without IV), at least put parry on it Q_Q But I wouldn't put parry on my relic anyway.