There are multiple reasons. Firstly, it gives an opportunity to show different sides of the characters. For example, Hermione might become more assertive without Harry's presence. Secondly, it can be used to introduce new plot twists. Maybe Harry leaving is part of a bigger plan by a hidden villain. Thirdly, it can be a way to explore different character arcs. Ron could grow from being a sidekick to a more independent hero. Also, it allows for exploring the emotional turmoil of separation. The bond between the three was so strong, and breaking it in a fanfiction can create a rich tapestry of emotions and new story possibilities.
Some fanfictions focus on 'Harry leaves Ron and Hermione' because it creates a lot of drama. The trio is so iconic in the original series that breaking them apart in a fan - created story can lead to all kinds of interesting plot developments. It also allows the author to explore the individual characters more deeply. Without Harry around, Ron and Hermione have to rely on their own strengths and face challenges alone, which can be a great character - building exercise. Another reason could be to introduce new relationships. Maybe Ron or Hermione forms a new alliance with another character in Harry's absence.
Well, one reason is that it offers a chance for alternative storylines. The original story was very much centered around the three of them together. By having Harry leave, fanfiction writers can take the story in a completely different direction. It can also be a way to explore themes of loss and loneliness. For Ron and Hermione, losing Harry, who was such a central figure in their lives, can be a huge emotional upheaval. Additionally, it might be a way to rewrite parts of the story that some fans felt could have been done differently. For instance, some might have thought that Harry was too overshadowing in the trio, and by having him leave, the other two can shine more.
Chapter 813, "She Has a Child?!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with In the past, he might have helped Meng WanZhi speak.
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