[DEV Question] Why is this allowed?

[Serilda]

A much more serious issue, I think, is that the game allows jobs to equip inappropriate accessories. I suppose it's a thing so that folks learning new content can equip VIT accessories for the extra survivability - but I don't think they're often used that way.

I would say they're used a reasonable amount. VIT accessories are very much a thing in PVP, for example, and in certain PVP situations INT accessories on healers could be too. I remember when I was lowmanning something or other in Coil I used a few VIT accessories on my healer in PVE. Then there's glamour, where the colour might be different for different versions (or you may not want to keep every single variant in a set where you like an earring design just to keep it glamoured across jobs). Exploiting this feature to artificially boost your item level and force others to carry you is, of course, not acceptable - but I wouldn't want to lose the underlying flexibility in a game with so little flexibility in the first place.

Simpler solution: force everyone to clear some SSS trial to prove their DPS on that job is in the right ballpark before queueing in raid finder? They can still switch to stupid gear for the actual fight but hopefully those accidents don't happen enough to be crippling.