Often, they are highly dramatic. In many cases, like in 'The Lord of the Rings', they are a clash between different moral forces. The battles can be used to show the courage or cowardice of characters. For example, in 'The Red Badge of Courage', the main character's internal struggle during the battle reveals his growth as a person.
From the search results provided, there was no accurate information about the distance from Tokyo to Tokyo. Therefore, I don't know how far it is from Tokyo to Tokyo.
The Jujutsu Kaisen manga is indeed ending. It's been a great run, but all good things must come to an end. The final chapters are bringing closure to the characters and story arcs.