DPS is the job of DPS.

[Gemina]

Even if Darkside cancels out Grit’s damage penalty, it’s still a penalty. It’s net-zero with Grit+Darkside; it’s +20% with just Darkside. Darkside doesn’t require Grit to be used, and there’s never a reason now to not have Darkside up 100% of the time since they removed the steady MP drain from it. So it’s still a technically a penalty.

In the context that I see, the +20% is a benefit when active, not a 0% penalty when it is not. I do get what you're saying though, and when trying to push tank DPS as much as possible, you are indeed penalized having Grit active. I just have difficulty assigning it the term "penalty"

You technically did:

No. She said, "Umm, there are still damage penalties in Grit. And I never said Grit doesn't have damage penalties. The tooltip clearly defines that it does. I am pretty sure I said with both Grit and Darkside up there is no damage penalty, but as I already said, I understand why there is still a penalty since it is not possible for a tank to cause the same damage with both Grit and DS up, opposed to just DS.