There’s the difference between being a writer and managing writers. If you are writing yourself it is at the speed of thought, if you are hiring somebody else to write you can possibly free yourself up to increase your throughput but you are going to spend time communicating expectations and reading/editing the results. If you develop a good relationship with the writer the effort to do all that can be small but if you don’t it sure can be tiring. (e.g. the New York Times has a strong and consistent style enforced in editing, people who write regularly for that paper learn to write in that style to make the editor’s job easier, people who write occasionally for that paper get their work seriously mangled by the editor)