Originally Posted by
Prothescar
last I checked motenten's spreadsheets simulate relic procs. additional effect poison probably not, but that doesn't matter anyway. Big thing here though is, if you're incorporating additional acc buffs/eva debuffs for the Atoyac to work (as Nynja has suggested), it's taking more valuable buffs away from the entire party and reducing everyone's DPS by a number that is likely collectively higher than whatever you're gaining by having OAT in your offhand, particularly on a job that already has a significant amount of multiattack.
Keep in mind this is for things that actually take buffs to hit or deal max damage to. I don't really make a habit out of modeling or caring about modeling fodder situations since no1curr.