Both tell a story, and every newspaper and magazine employs editors to ensure that the story is told well. Merrill Zimmershead, a sole practitioner in Northern California, says he likes to tell his clients that he will bring in legal research specialists to prepare the needed motions, much as a doctor uses a laboratory to run specialized tests. She doesn't do them herself. I have the 'lab work' done by a professional writing and research service. He says that it makes sense to him and to his clients.
Few attorneys can really manage a busy practice and still write excellent briefs.
Not every case may justify the expense of bringing in a professional writer, but some inevitably will. The practitioner who identifies those cases and brings in the professional will enjoy the satisfaction of contented clients and a busy practice.