Thank you for completely missing my point entirely. The discussion here isn't ilvl or left side gear. We're talking about the benefit tanks get from using Fending accessories, which currently is absolutely nothing once a specific HP value is reached. VIT is only useful until you're no longer in danger of getting gibbed by a boss under normal circumstances. Assuming that you're a competent tank and your healers know what they're doing then after you hit that point VIT is completely useless aside from making your epeen tingle by seeing a larger number next to "HP".
Like I said before, VIT only does one thing and it doesn't even directly influence how we play our job. It has 0 impact on our outgoing damage, our incoming damage (stoneskin aside) or our enmity. STR, DEX, INT and MND all directly contribute to increasing the performance of their respective jobs. We are the only job that has two "primary" stats and that's what needs to be changed.
The best and probably simplest idea for them to fix this is to just add STR to VIT accessories. No DPS would sacrifice using an appropriate ilvl Slaying piece to gain extra VIT. In addition to this they should remove parry as a stat option or have it included in all tank gear in addition to normal secondaries. As it stands now it's completely useless and there's no point in stacking it because you'll never see a noticeable difference in your incoming damage outside of large trash packs.
Damage mitigation based on RNG isn't true mitigation, we have no control over it. Even if you stacked it on every slot and managed to have maxed parry value for each you're still only looking at an increase of 2~% or so parry rate with no change in the amount you parry for.
Their other option would be to rework how our skills work just like how they altered DEX when Ninja was introduced and have all of our damaging weapon skills be modified by our VIT value.