Why should I hire a dedicated writer if I have people with better understanding of the system? Also worth noting that like in any profession the most writers are... mediocre. Especially when you hire someone on contract. I had mostly bad experience with them in past. They happily charge $1000 for a few pages of garbage that is not even LLM-quality. No creativity, just pumping out words.
I can chip in like $20 to pay some "good writer" that "observes, listens and understands" for writing documentation on something and compare it with LLM-made one.
"Write a manual for air travel for someone who never flew. Cover topics like buying a ticket, preparing for travel, getting to airport, doing things in the airport, etc"
Let's compare!