Except for the part in the wording of the tank stances where it says "significantly increases enmity generation"
That makes it sound like the enmity bonus is going to be larger than from the old tank stances.
Plus, you're not going to ONLY spam Total Eclipse any more - you have the 2-part AoE combo now, which has a higher total potency and thus higher enmity generation.
That's about as fringe as it gets. If you end up wiping because of the PLD's AoE damage, your group's got problems to work out that have nothing to do with job design.Another thing that people haven't considered is when you simply DO NOT WANT to damage a particular mob. I can think of several examples throughout the game.
1. Boss mechanics where killing certain enemies is detrimental (eg. Bombs versus the slime in Copperbell Mines)
2. Boss fights where certain enemies need to die in a certain order.
3. Boss fights where certain enemies need to die in a certain place.
If we're always going to have to damage mobs to keep aggro, it only increases the risk of failing one or more of these mechanics. Yes, we have Provoke, but the recast time in addition to its single target nature make it significantly less useful in these situations.
Not to mention that DRK and WAR had no way to grab AoE threat without doing damage in SB (outside of Ultimatum with its ludicrously long CD) and I don't recall that causing issues.