Say that LLMs are increasing your productivity by 20%, just for argument's sake, and that a company used to have six technical writers, but one of them recently left. Why hire a new a replacement when the five remaining LLM-augmented writers can now do the job that six humans used to do?
That is how automation often replaces workers: not by doing 100% of what humans used to do, but by increasing their productive output.
Maybe you are lucky, maybe the company has an increasing need for writers and keeps hiring them. But maybe the productivity increases from ever-improving AIs are able to catch up with that increasing workload.