I see it like this, as Larian probably intended it that is...
She deserves a chance to uproot the injustice she's been subjected to and stand up for those still under the boot of Zariel. Gortash is off her to-do list, I feel like Zariel is on it.
Take the fight to Zariel.
Regarding a one and done edit/addition to content, why? Is it so definitive that this be their only attempt at altering/adding Karlach content?