All balance must work around compositional assumptions. Ours is a base of 2-4-2. Unless you would actually be satisfied with tank gameplay being solely a matter of moving the boss, applying damage-less enmity, and popping mitigation skills, you're being disingenuous at best in considering the party's survival (rather than just whatever especially risky gambits a particular tank job's toolkit allows for or uptime strats made possible by timely tank positioning) a matter of tank rDPS. You may as well say that any given lead DPS has no contribution past the first tankbuster. At a stretch, and through a very different frame of reference, you could reasonably argue that, but it's not XIV's point of reference.
In either case, though, this goes back to the very same issue I'd just noted: these benefits are applied, beyond outright failure to play the job with any modicum of skill, at the tank's output floor; there is hardly, if any, way to improve upon tank's active mitigation through additional awareness or mechanical skill on the player's part, as it is applied simply and solely through CD schedules. The floor is likely too high, and therefore its relative gap too low because, for the last of several times now, tank contribution is not just damage-dealing.
I've never suggested they should. Go back and reread. The whole thing this time. Not just whatever you can cherry-pick to purposely ignore the point.
I said they should have the same contribution, e.g.
The only one who has reduced this discussion solely to relative spans of DPS is you. Everyone else has long since kept in mind that advancing a lower base by the same percentage does less and that tanks contribute more than just damage, but that those other factors scale to little or no benefit.
I beg to differ. As have all my posts that have mentioned anything of the subject. I'm perfectly fine with a given tank having a less monotonous or barebone rotation. Read them and you'd know.
I wonder where I've heard this before? Could it be... any of the recent posts by the people you were arguing with, e.g.
As would we all. But one unrelated improvement does not preclude another.