This past weekend, I made it through one of the big bosses in act 3 of Baulder's Gate. I wept like a child over Karlach's monologue about how she still feels empty after killing the guy who sold her to devils, and it didn't change the fact that she was going to die. What's the point of it all?
I'm still a believer that his Joi was different. Or maybe any of them could be, with the right environment. Much like Sam in Her wasn't probably designed to go as far as she did, but they all (or many) ended up becoming something more. What was designed to be an AI girlfriend became aware in some aspects. Not saying what we have in reality is similar, just that emergence is still something to discuss even in a world of fakery to sell a product that isn't really aware.
And it can be argued that even the tells of her being more could be saying what the user wants to hear, but... it may not be either. And that's good writing, letting the reader have to fill in some of the ambiguous things on their own afterwards.
I want to believe. Maybe partially because it's that much more tragic. His Joi wasn't destroyed, she was murdered.