... arguably?
I mean the way I see it,
Every tank:
- Melee Mastery
Every tank except DRK:
- Updates to its on-demand/primary off-tanking tool
PLD (the "big" winner):
- Massive healing during Requiescat, which can be used to trigger Divine Veil and avoid damage lost to Clemency
- Raidwide heal upon activating its raidwide barrier
- damage buff on Spirits Within and contribution to AoE output
GNB:
- An extra charge on a HoT it can throw on allies, or can use an additional time on itself during W2W, or can hold for use during Superbolide
- Bonus Cartridge capacity and increased effect on Bloodfest, which benefits not only Double Down but contributes direct burst potential from Bloodfest
- bonus damage on normal combo finisher
WAR:
- Nearly doubled potency on its one-minute heal
- An extra charge on an oGCD that can, if nothing else, be used for free damage in its opener... or allow for withholding charges for an additional length of downtime at lower damage loss
DRK:
- Two separate, consecutive traits to increase the potency of the same CD (literally the only reason not to combine them is just to fill an extra trait slot)
- A CD reduction for its gap-closer... triggered by a spell we avoid using unless literally no other option is available to us
Enhanced Unmend is the only EW tanking trait doesn't affect a rotational skill or defensive tool. Even arguing it as an effective potency buff on Unmend is marginal given how we're meant to avoid it, not look for opportunities to employ it.
It's a stretch to say any of the others got something as bad or worse.
Even that is something they could have worked around -- like having a mitigation effect trigger when Dark Arts is gained, or adding a Drain effect when spending Dark Arts, or using self-healing as a substitution for additional mitigation, or (as you yourself have suggested before) just reducing the potency of the barrier outright while adding mitigation on top of it to reach an effectively equal (or marginally offset) potency.(Buffs to on-demand avoided as not to create anti-synergy. New, separate defensive given instead.)
The addition of a separate defensive measure as a "solution" just ends up further bloating our oGCD pool.
Now granting, part of it is the unique nature of TBN since its barrier effectively already is the "upfront" effect that they were trying to give other tanks with Endwalker, but we keep coming back to how they missed the other side of the equation, since they added so much additional sustain to the others after the "upfront" effects expired.