If they wanted Karlach not to be fixable from the beginning, they could do her whole quest differently without hints, that you can save her and make her story really sad and no one will probably be against it. But they've implemented Gondians and Dammon into the game and didn't expect that someone will ask, how it is not possible to ask them, when they are the key persons for the fix? I don't think they are completely honest with fact, that Karlatch wasn't mention to be fixable from the beginning. There are too many hints that at least in some stage of the development, this meant to be possible.
If they wanted her truly dead at the end, they should do it correctly and close all possible (I mean the obvious ones) ways how Tav can save her. This will be sad story, but well written story. I hope they didn't do this patch 5 fan service like we wanted her dead, but fans not, so we'll let her live.
