I already said that. (which is where the real issues stem from. Though I would still argue for plenty of work arounds.)
(Or did you mean "trait", in that tanks mitigate dmg, and BLUs try to survive attacks, rather than "stat", which is how Im taking it in context of the 2nd part. Which imo, is pretty much the same thing. WARs use holmgang in speed runs as if it were their only mitigation. The trick isnt to lower dmg, but to survive it. THEN lower it.)
Why would anyone do that? (we know SE makes a lot of mistakes, but that seems too obvious.)
*edit*
I dont really see any of this meaning anything to FFXIV. (or even outside of it)
Though BLU being a "support" i wouldnt fully disagree with, but with how FFXIV is set up, and since the job best suited for being a caster tank is now a DPS, BLU is the 2nd best option for being a tank.
BLU just needs a minimum of a 0.5s Cast bar, which leaves them mobile, and able to take hits w/o worry of spells being canceled constantly. It prevents them from kiting as a tank, since they would have ranged attacks.
It also prevents too much auto attack dmg, which imo is what would make their tank stance not need to lower thier base dmg as much as other tank stances. (including the rare interupt, due to perfect timing fo auto attacks and your 0.5s cast time.)
WAR used to be the "Support" tank, but now PLD and DRK have the support, with PLD having the most.
Personally want to see more party utility from BLU, similar to PLD, but with a higher skill ceiling like WAR, but more so for survival, less so dps/threat.
(Would like a AoE regen White Wind to replace the tanks typical AoE threat, as they then use cone Breath Spells as filler on trash mobs. To make up for trash mobs hitting far more often, give breath a 1.5s cast bar, a much shorter CD version of surecast, and make it only stop interruptions of normal attacks. But crits can still interrupt by 50% or higher. (making awareness work well with it) Ideally ready at the start of each pull, but not last the whole pull, so u have to go into melee attacks/melee spells.
So far every tank has their ranged pull on a 15yalm limit, with PLD having a spell cast that reaches the normal 25yalms.
I'd like to see the ranged pull on a 25yalm, but with a 0.5s cast, sol you still have to stop moving to use it, but literally only for as long as u press the button, and can pretty much move instantly right after.
I'd also make it a DoT, so it wouldnt be spammed for kiting purposes. (similar to Aero)