Professional communication has a completely different goal than a student essay, and it's weird you conflate the two. A student paper is useless as an artifact, the actual value is for the student to learn how to write the paper. If a coworker sends me a long email for me to read it should provide some actual value.
I'm arguing against people who essentially say that running the LLM is useless; just send the prompt.. Obviously that is true if the person does zero additional value add, but then that person probably sucked as a colleague before LLMs anyway. When you use an LLM agent correctly you are adding value beyond just the prompt, and those three additional paragraphs won't just be extra noise. Especially if the agent is automatically fed your personal context.
An essay states a hypothesis and then uses first and second party sources to validate it. I'm not conflating anything, it's just a good abstract example of the type of knowledge synthesis work, which is why we make kids do them.
A business strategy proposal is nothing more than a specific type of essay where the research sources are internal research results, market trend analysis, etc.
A technical design doc is an essay about the best way to implement a feature.
An "executive summary" is just an abstract, and the MBR puts the latest research citations and raw results in bullet points.