Been checking into this thread a few times and will continue to post once in a while to keep it going because I really do want Larian to address karlachs ending (aswell as a few other companions) but karlach getting a happy ending *option* atleast
I would say is pretty important to me for many of the reasons already stated by people here.
-game built on options and choice matters where one character out of the lot just gets the short end of the stick no matter what you choose just doesn't feel good in the end
-the feeling of hope baiting through out the game
-many options present to try and fix it but none are able to really be pursued.
and most importantly its Karlach...Mama K deserves a happy ending dammit lol

that being said little off topic but if Larian does see this post, I think it was earlier discussed here how...pointed karlachs act 3 romance scene was. basicly the actions and scene definitely leans towards a female to female intimacy
which now that i think about it As my male tav -it was quite surprising to see my 7ft tall brick house of a barbarian in that scene get lifted up and laid down and then...well for what can only be described as *buttstuff* ensue.
Now I personally couldnt stop laughing at that scene, didnt ruin it for me but it did feel...odd. so as a side note to karlachs ending being addressed if romances get relooked at and tuned up at all it would be really cool if another scene was added for male tavs in that act 3 scene.
hell! doesnt even need to be a new scene maybe just switch the models if the Tav is male. let us twirl the 7ft tiefling like the princess she is! smile