I'd rather have a relatively authentic image than an AI-generated/modified one, and hopefully with the C2PA they're slowly integrating into the system, it'll be possible to tell the difference. But to each their own preference. There's also a very subjective tolerance to what is modified: is colour grading fine? Is retouching skin spots OK? What about removing glare? And so on.
Besides, I think that people who buy those more expensive lenses don't want to spend too much time in post-processing if they can avoid it, so there will always be an audience for those products. But I agree that those small improvements cost more and more in weight, size and price.