How do we feel about tank damage right now?

[Shurrikhan]

Is that parity ?

When and only when your "health insurance" provides, on average (across multiple encounters), the same benefit to average clear speed (across multiple attempts, including wipes from within normal/optimal compositions and excluding outlier excessive risks) as my increase in salary.

That's the whole point. You've been accounting for only one part of the equation when balance requires that the gestalt opportunity cost/benefit of one must be equal to the gestalt opportunity cost/benefit of the other.

I've already agreed several times in this thread alone, including in posts you have already quoted, that tanks should have greater complexity, as to warrant a more reasonable range -- including a lower floor as to better achieve parity across all levels of gameplay. But that, if done alone, would be to put the means before the ends; without a reasonable goal, the method is irrelevant.

The goal is balance. Though that balance may be unnecessary from a compositional standpoint, since most fight's specifically tank-enforcing events are enough to guarantee tanks their spots despite however little tanks may otherwise provide, it is still very useful in giving a feeling of right and proportionate reward. And before you disparage that as subjective dross, let us note that people play games when they find or expect to find it more fun (a wholly subjective feeling) to be doing so than to not.