400 words for describing the nature and scope of a topic may not necessarily be considered long, especially if the topic is complex and requires detailed explanation. It's important to provide enough information to help the reader understand the key aspects of the topic and its relevance. However, it's also important to ensure that the information is concise and to the point, without unnecessary repetition or verbosity. Ultimately, the appropriate length for describing the nature and scope of a topic will depend on the specific content and context.
