I'm only "Mangling" terms, if you're one of the people who believe that "Mitigation" only applies to preventative measures.
There are other people who believe "Mitigation" applies to anything that lessens the effect of the incoming attack.
As I mentioned in my first post, Tank C can be considered to have "Mitigated" the attack.
No-one gives 2 hoots if he went down to 10K HP then healed up to 60K HP instantly or if he just took 40k damage from the otherwise 90K damage attack. The end result is the same.
The only time that healing won't have this same end result, is if the damage is enough to instantly kill the Tank before they can heal. But in this game, there is none. Not when literally any CD will cause it to become non-lethal.
The end result is what matters for mitigation, rather than the means. Another example would be Tank D using a skill that gives him a temporary 50% max HP boost, meaning he goes up to 150,000 Health and then takes the full 90,000 damage and goes down to 60,000 Health. He has also "Mitigated" the attack despite not having done anything to actively reduce the damage of the actual attack. This is the same premise for Shields as "Mitigation", bolstering up your EHP to make the attack "Weaker" relative to your EHP total.
The 2 terms are not mutually exclusive. Self-healing is mitigation. Self-healing is recovery. Self-healing is sustain.That does not make self-healing mitigation. Self-healing is recovery.
Just like, other types of mitigation can have multiple terms. Shielding is mitigation. Shielding is sustain. (Though, people also like to argue that latter point. However, it is nontheless true as it prevents your HP decreasing thus letting you sustain more damage and with enough shielding you can simply not take damage at all *Cough*Stormblood Critlo*Cough*)
As I've said REPEATEDLY, the only time healing does not work as mitigation is when an attack outright kills you.The 2.0 Warrior is a perfect example of why self-heals are not mitigation.
It's a small caveat, but doesn't negate healing as mitigation outright. As the same can be said about any other form of mitgation. I.e. Getting a shield only works so well as your total EHP survives the attack. Damage reduction only works so far as it reduces the damage of the attack to below your health total.