An author may choose to use a third person narrator so that the reader can feel the story and imagine it as his point of view since the narrator is making up a story to the reader.
Explanation:
third person uses you, and etc so the narrator is telling your story.
1. A trustworthy narrator: a third person narrator is typically giving a bird's eye view of what the story entails, very often, they're are also not clouded by the feelings of the character compared to first and second person narrator.
2. Narrative Flexibility: a third person Narrator is able to switch between characters and places at a time compared to first and second person narrative.
3. Robust character Development: Using the third person narrator enable the spotlight to shine on more than one character, we are able to get a full scope of the plot from different angles.
Answer: It is important to write down your ideas so you don't forget them, and also so that you can re-read them again later, to make sure you aren't missing anything. It's also a nice thing to have to base your paragraphs off of, one idea/discovery for each paragraph. It helps space it out and also organizes.
