Most disappointing answers are not a failure of the model, they are a question that could be answered forty different ways being answered one of them. "Write me a summary" leaves length, audience, what to keep, and what to do with uncertainty all undecided — the answer picks silently, and the result is fine, and not what you wanted, and you cannot say why.
Section one is the whole point: it lists the decisions your wording handed over. Reading them is usually the moment the problem becomes obvious, because two or three will be things you had a firm opinion about and never said. That is also why the section is more valuable than the rewritten prompt — it teaches you what your requests habitually leave out, and most people leave out the same two things every time.
Section two is the honest boundary. A better prompt cannot supply facts about your situation, and a model asked to be more specific without them will invent specifics. Being asked for them instead is the difference between a prompt that fits your case and one that reads well.