Why not equipping 2 VIT accessories and 3 STR accessories ?
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It only matters for tank though, they're the only job that actively relies on more than 1 base attribute strongly. DPS and Healers generally won't want to sacrifice any STR/DEX/INT/MND for a little extra VIT or some additional secondary stats. The highest craftable acc right now are i90 so aside from tanks they are pretty irrelevant at this point regardless of melds.
If a DPS uses crafted accessories, they are losing out on DPS to gain Vitality. If a healer uses crafted accessories, they are losing out on healing potency to gain Vitality. If a tank uses crafted accessories, they are losing out on unnecessary health to gain DPS. Only one of these is consistently worth it, the others are replaced due to no longer needing the extra Vitality. A tank typically doesn't want to completely shed Vitality, so having a mix of it and STR is ideal.
Well, being an "OT" is not a standard function but players took advantage of it and asked them to DPS instead. In other words, it's not an official role. You're tank, you tank. So, I think it'll be unlikely to the dev team to release accesories and/or armor pieces with said stats. It's true that you can either go cheap and combine both accesories or go expensive and pentameld ilvl 90 accesories soon to be replaced with ilvl 110 in 2.5 possibly.
Personal experience incoming which may or may not apply to yours needs: On my end, I prefer to out-DPS my job, I dislike the idea of not doing damage, even as a MT, that's why our war puts 240+ DPS on T12 (Depends if he's inspired or not) and I pull close to the 190 DPS, making the fight a lot easier. T10 and 11 are a joke. Yeah, both MT and OT wear pentamelded ilvl 90 accesories. Saying this, it's all matter of optimization, you can say "+30 DPS is nothing" but it adds up. You never have enough DPS. That's my raiding rule. :P
In the end, you don't need a lot of HP in the FCOB, but in T13. This mostly applies to the other roles... as an OT you can be perfectly fine with either pentamelded accesories or the vit/str accesories mix. The MT on the other hand, if you have good healers, it won't be an issue. Go pentamelded or... vit/str accesories mix. If not... gosh, wear your vit accesories. This was mostly the option for brand new players stepping into the final Coil, because they pretty much were ilvl 110, so they needed the HP and they wanted to not kill their DPS in the process. Nowdays, with more and more people beating said content and getting some Dreadwyrm shinies combined with the tomes gear, including the weapon upgrades, using these accesories became optional, because the base DPS should be good by now.
I have a proper tanking set and a DPS set for my WAR. If I am required to be MT at least some of the time (through enmity swapping at least), I'll use my tanking set. If I'm only there as a "third wheel" off-tank that's not necessary to do anything but DPS (i.e. most bosses in Syrcus Tower), I put on my DPS set. Thankfully I can change my gear entirely mid-run so long as that doesn't change my class/job.