It is generally not good writing to dangle a bunch of solutions to a problem in front of the reader, then skip ahead a bit and pretend there were no solutions without ever justifying why those potential solutions dangled previously were in fact impossible. It feels so horrendously railroaded and conveys a feeling of a desperate writer rather than a desperate character.
It's the same with V's problem in Cyberpunk 77. The friendly doc can't fix it and the corporation that owns the tech obviously isn't going to try, therefore V has no options and cannot be saved. Well, except there's a whole heap of other tech companies out there, all of whom would kill to get that tech. It's a nanite based tech so one presumes that enough EMP would slow them down a lot. They're following a programming, but why can't that programming be changed? It just cannot, because then the plot falls apart, therefore it is impossible!
Similarly, we have a character with a failing mechanical heart. We have access to a bunch of operational mechanical hearts of a newer generation. We have access to resurrection magic. We have a literal god of death on hand. Why is this even a particularly hard problem to fix, in the grand scheme of things? Why does it have to be? To be brutally honest, the ending here is fanfic level terrible. If it has to end badly then that's how it is, but at least make the story work. Make it meaningful. Make it an impactful statement of some kind. At least put in that much effort.
This is the big problem, Its not that she has bad endings. Its that she only gets bad endings while potential solutions are RIGHT THERE and never touched on in any depth.
At least with V you find out that the chip is Arasaka's multi-trillion dollar magnum opus, and requires multiple other technologies and systems that they alone control, thereby explaining why its not so simple to fix or remove (given its literally keeping his brain in tact as well). With BG3 and Karlach, you find the factory right around the corner, and the people that could build a new engine are all there, waiting to be rescued. The Gondians are done dirty by the writing too, as some of the greatest engineers on the Sword Coast, they're just treated as victims that scurry off after being rescued. Zanner Toobin at least deserved to repay the favor of saving his daughter who he lives for, and slaves away to keep alive further than just blowing up a factory. I feel that given his disposition and gentle nature, he'd be more than willing to work with Tav, Dammon and Karlach to save another life. Its gutwrenching.
