Keep in mind Larian are the ones who brought this fantasy to life, the character you are so invested in, Karlach.
Would you prefer they rush the feedback just to appease forced headcanon? Or would you rather it be something that blends seamlessly into their original interpretation, but fused with community feedback? Don't you want it to retain Larian's vision to make it more... satisfying?
Your feedback and passion are at the core, flattering to Larian I'm sure. Getting frustrated and impatient is understandable but try to tame it a bit, they have delivered an epic fantasy that certainly couldn't hurt from polish and creative tuning.
The presence of obvious solutions in game (infernal iron, enriched, etc. etc.) to Karlach's problem could very well be the product of a narrative decision to have her be the token bittersweet ending, or simply left to be added in later on through definitive etc.
Maybe they didn't expect people's response to be so passionate but now they know.
