Yea i also doubt the interviewed people were much involved with the character writing and probably just said something random on the spot lmao. Still gives off a weird vibe from larian, claiming that her having a miserable ending was envisioned from the start. Opting to say ''well i guess people found it sad so we added a more hopeful tone with the epilogue'' instead of engaging with the actual critizism that her questline faced in the first place, like the plotholes and illogical explanations on why the engine cant be fixed, is pretty disappointing.
You can still create good drama in dnd, just look at astarion or shadowhearts story arc. But if you write a tragic, miserable story where a character is destined to die, ''karlachs heart is a bit wonky and cant be fixed'' is not really gonna work in a dnd world where death isnt as final and much more avoidable than in other settings. This, plus acknowledging the plotholes and the game poorly communicating why exactly karlachs engine is unfixable, is what i wish larian addressed and gave more input on, instead of minimizing the raised criticisms to the notion people hated her ending cos it was ''sad'.