I enjoy writing. I have yet to use one of these tools to "polish" my writing, and I doubt I ever will.

As to the thesis, yes. I fully expect the world to sound even more bloodless and corporate than it already had. Invectives to "write for understanding" and to "keep it simple" and the tendency to turn complex relations into nouns had already put linguistic creativity on life support. The wide adoption of these tools is just the final nail required to seal the coffin.

Before you reach for an LLM, consider that our imperfections often contribute significantly to our humanity and that innocent mistakes and misinterpretations, while they can be the source of pain, are also the source of much that is novel (Harold Bloom wrote an entire book about this idea).