I'm 99.999% sure the positional accuracy is for melee only (MNK, DRG, PLD, WAR).
Prove me wrong though. Go do the testing yourself and show proof that its ranged too. But so far, I've only seen melee reporting it.
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Well, positional accuracy definitely applies to Bard as well.
It seems that maybe spells are all considered to be omni-directional though, so they always count as hitting from behind?
That would make sense as to why their accuracy caps have always been calculated to be lower than physical damage caps.
None of my mages are 50 or I would certainly test it.
But if it's true that spells are omni-directional, then you're definitely right that Hawk's eye is pretty much worthless for BLM/SMN.
So what would the accuracy needed for bard then be for the front? I am just somehow skeptical since at 469 I have yet to miss anything on T5, could just be RNG luck I guess.
But more on topic, hawks eye is completely useless for a caster since as said, you should always have the accuracy needed if you are main classing it for higher end content.