I agree with everything so far but also wanted to add its annoying that Wylls
stuff overwrites the Tav romance ending. I believe it should simply be another option instead of an override as well as the potential option for all 3 of them to go.
Also if they want to fully embrace the tragedy I wouldn't mind an ending where Tav could perish with her in a final hug/kiss but would rather a happy ending be implemented 100x more. I am awful at role playing so my Tav was simply a bored noble before being abducted and actually loved all the adventuring. Them passing with Karlach wouldn't be that bad since she wouldn't be that interested in going back to a boring loveless noble life. Not sure I would actually be able to follow through with the ending I just requested though, I don't handle tragedy that well lol. I would prefer her slaying demons with Karlach and Wyll way more if we are stuck unable to repair/upgrade her heart.