None of the endings are happy. I think the big problem comes from the concepts of soulkiller and the engrams. Engrams get treated like they're the real person in digital form. Issues only seem to arise when you use soulkiller on dead people or otherwise damaged brains. Johnny is treated like he's alive again, many characters have dialogue alluding to this.I don't really get it why everyone thinks Aldecado ending is happy one. Alt pretty much seals the deal with V dying and replacing with copy and overexplains the soulkiller. Another thing, the goal of V really missmatches with the ending, never it was really mentioned that V wants to leave the city (unless I missed it). And the fact that you go out with your lover and supposedly new family to Arzinow or whatever just to die in 6 months of agonizing death and leave them alone without you? Yeah, in my head, this is a really sad ending pretending to be good ending.
But what the hell do I know, I'm just a random pleb, no idea what CDPR is thinking with this. We might get conclusions or we might get fuck all.
But if you can't get over the fact that you do die when soulkiller is used - you loose your soul in all endings, this is a big plot point thing in the game - if you think V is just a copy and nothing else - then none of the endings will be neutral or good for you.
They will all be bad.