Which is why there is +hp.RNG based mitigation mechanisms are not a replacement for static mitigation mechanisms for spike damage situations. As I have said time and time again, Evasion doesn't isn't a factor when you considering the massive spike hits. It's explicitly because of the worst case stuff that you're discussing that any Evasion tank would need the ~25% +hp *because that gives them the exact same eHP as a WAR or PLD*.
What you continually seem to be incapable of comprehending is that 20% evasion is *not* replacing 20% DR or 25% +hp/+healing. 25% +hp and 20% evasion are replacing them. Evasion is a mean mitigation stat. It does not affect a tank's eHP specifically because it can, and will, fail. You do not rely upon Evasion to keep you alive through something like a Death Sentence. You rely upon the 25% +hp that you would be getting *alongside* the evasion.But another huge problem is once again, is debuff attacks and death sentence. What if you can't evade them? Imagine a PLD facing down DS without shield oath. Because if 20% evasion is replacing 20% dmg reduction or 25% hp/healing and you can't evade a death sentence; you're basically a PLD without oath, or a WAR without defiance.
I have said this *over and over*. How do both of you keep missing this and act like Evasion would be the sole benefice given to this theoretical tank?
That's an ignorant viewpoint because, if you only care about eHP (which is what you keep bringing up), you're leaving out mean mitigation, which would be like giving WAR 25% +hp but no +healing: yes, they would be able to survive the same hits as a PLD, given the same starting hp, but it would take 25% more healing to keep them at that place.Listen, I've said it once, I've said it a thousand times. Total mitigation over a fight doesn't matter.
You *have* to account for both eHP and mean mitigation when coming up with a tanking. On top of this, you have to realize that not all mechanics affect both, which I have said multiple times. Any tank getting a substantial amount of evasion is going to *have* to get something to bolster their eHP specfically because evasion doesn't do *anything* for eHP; it's a pure mean mitigation stat, and, honestly, it's not like the math is even remotely hard.