Could be a bit of both. It takes a certain writing skill to start at a high level and efficiently narrow down the topic without going off topic or being too brief. It is difficult to write a good literature review in your first ever draft, so I would consider writing a detailed lit review and then you can cut it down through the drafting process. Personally, I write the headers first then the first and last line for section section, then bullet points of each section (so I don't repeat myself and can slowly build concepts), then write the text. I can't tell you if it is to vague but looking for a good structure can help refine your research question.