1. They generate a lot of fluff that people are accustomed to thinking of as a "sign of work" or "sign of intelligence", but now that counterfeits are easy they are not (should not be) valuable anymore.
2. That fluff (and grammatical annoyances) make readers zone out instead of getting what you want them to get from the document.
3. Much of the document is often an extrapolation from a much smaller set of data like source-code or a spreadsheet or the prompt-stuff. If you really believe the tech will get better, then you should be preserving those higher-truth artifacts instead, and use them to generate an improved extrapolation as-needed.
To me, code is a creative endeavor. I know that this isn't a universal feeling, but to me the act of creating is more personally valuable than the creation. So when I read code that I wrote (with the help of a tool) that doesn't sound like me, I feel like I have robbed myself of something that I find personally important.
My employer, or anyone else, doesn't care and probably shouldn't care about my experience during the act of creating. The creation is what matters to the external world.
But like, I don't think I'm alone in valuing my own creativity and finding that creativity in code.
(And please don't misunderstand. I'm definitely not arguing that code produced should be "clever" or "creative" in the other sense of the word. I'm just talking about the experience of creativity.)
People have started treating writing as a commodity because generating words is commoditized. But thinking has not been. If anything it’s become more valuable because people are turning off their brains.
As an EM, I know that it’s an investment worth making and encourage ICs accordingly.