What could be the reasons for 'Harry and Hermione quit fanfiction'?

Another reason could be negative feedback. If they received a lot of criticism from the readers, such as complaints about the plot not being true to the original spirit of Harry Potter or the characterizations being off. This continuous negative response might have made them lose their enthusiasm and finally quit caring about writing the fanfiction.

It could be that he has a bad accident in the potions lab. For example, a potion explodes and nearly kills him or one of his friends. This traumatic experience makes him lose his confidence and interest in potions, leading him to quit as seen in some fanfictions.

Some fans might be disappointed. They were probably looking forward to new stories about Harry and Hermione.

In some fanfictions, there might be a new magical element or prophecy that makes Harry question Hermione's motives. If the prophecy says something about Hermione being involved in a dark plot, even if it's false, Harry may start to have doubts about her.

In fanfiction, Hermione's obsession with Harry could stem from her own insecurities. She may see Harry as someone who is more confident and free - spirited. She is obsessed with him as she wants to be part of his world, which seems more exciting compared to her own studious and rule - following nature. Additionally, their friendship has a strong foundation, and the writers of fanfiction might exaggerate this into an obsession to explore different storylines.

Maybe it's about her study habits. For example, she always preaches about everyone following the rules in class and doing their homework properly. But then she might break a minor rule herself when it comes to getting access to a certain book in the library for her research.

It goes against the canon. In the original 'Harry Potter' books, their relationship is clearly a deep friendship. Changing it to a sexual relationship in fanfiction is a misrepresentation.

One possible reason could be a misinterpretation of their relationships. Maybe the author wants to explore a different dynamic where Harry and Hermione bond over Ron's perceived flaws, like his occasional laziness or his insecurities that might come across as annoying to them in this fictional scenario.

One possible reason could be that Hermione might be too overbearing in her studies and constantly nags Harry about his schoolwork in the fanfiction. This could annoy Harry and make him mad.

One possible reason could be their different career paths. Harry might be more focused on Auror work which is dangerous, and Hermione, being the practical person she is, may not want to live in constant fear for his safety. Another reason could be a growing apart in their values. Maybe as they get older, Hermione realizes that Harry has a more impulsive nature when it comes to making decisions regarding the wizarding world's politics, while she prefers a more calculated approach.