In the original story, Voldemort doesn't have access to Harry's memories in this way. So in the fanfiction, it creates a completely new scenario. It allows for a different kind of exploration of their relationship. Instead of just their physical and magical battles, we get to see a more psychological interaction.
The original Harry Potter story focuses on Harry's journey to defeat Voldemort through his own actions and the help of his friends. But in this fanfiction, Voldemort is given an inside look into Harry's life. This changes the power dynamic. Voldemort may start to understand Harry on a deeper level, which is not something that happens in the canon. It also might lead to different plot developments, like Voldemort having a change of heart or using the memories against Harry in unexpected ways.
Well, the original story has a set path of events and character interactions. In 'Voldemort watches Harry's memories' fanfiction, it takes a huge detour. For instance, Voldemort might learn about Harry's relationship with Dumbledore in a very different way than he would in the original. This could lead to Voldemort rethinking his enmity towards Dumbledore or even trying to use the knowledge of their relationship to manipulate Harry in ways that are completely different from what we see in the books. It also gives the writer the chance to explore different themes like redemption or a different kind of understanding between the two main antagonists, which is not really a part of the main story.
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Chapter 315, "It seems a bit difficult to get a perfect score", is the clearest early answer because it turns Madam Jiang's situation into a concrete plot event. Early on, Jiang Li, however, looked at the delicate draft and said, "Mom, why....
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