As far i see nobody is asking to give tanks specific and unique traits that can be a potential imbalance on the future, nope they are asking to make tanks rotations be way more diferent from each other, aka not having for example 3 of them inner release, or the same gauge system working exactly the same way like WAR and DRK, and mitigate the damage on diferent ways but all of them mitigating the same amount of damage and not being literally all rampart+sheltron variant and sentinel+shelltron variant and then invul witch is tanks today 99% of the time.

This kind of mitigation and dps rotations use to be totally diverse and diferent from each tank back in HW and SB and tank inbalance where totally done by pasive traits and numbres more than anything else, aka slashing debuff, PLD phisical exclusive mitigation and DRK overall lower numbers wich have nothing to do with the gameplay of each job.

then we have stuff like anti knockback wich in the past use to be DRK using his gap closer to catch up and PLD use tempered will to stay on his place, this bring unique gameplay options to dealt with anti knockbacks, in resume even back in HW where the balance was more rough no tank was actually excluded and all of them where viable to complete every kind of content and i personally want back HW tank diversity back but without the problems that make his balance rough wich doesn't exist anymore wich are the slashing debuff and PLD physical mitigation only.