What crucial aspect does a good summary omit?

A good summary aims to concisely present the main ideas of a text without introducing the summarizer's personal biases or opinions. This allows the summary to remain objective, focusing on what the original text conveys rather than the individual's interpretation of it. By omitting personal opinions, the summary serves its purpose of conveying the author's intended message clearly and accurately, ensuring that the reader understands the original content without the influence of the summarizer's perspective. This is essential because the goal of a summary is to provide a clear representation of the original work, making it accessible to others who may not have read the full text.

While other aspects, such as repetition of arguments or key evidence, can be relevant in certain contexts, they do not hold the same crucial importance as maintaining an objective standpoint in a summary.