They are. Edits in comic books could range from color adjustments to reworking dialogues or adding/removing panels to better suit the overall theme and flow.
In the manga, Tanjiro and Kanao don't end up getting married. The story focuses more on their battles and character development rather than romantic pairings.
Well, for copy editing a novel, you need to focus on language accuracy. That means correcting punctuation, fixing word usage, and ensuring the sentences are structured properly. Another important aspect is to maintain the author's voice while improving the clarity and flow of the text.
The author's edits in novels are important for several reasons. Firstly, they can correct mistakes like grammar or continuity issues. Secondly, through edits, the author can adjust the pacing of the story. A slow - paced part might be tightened up to keep the reader's interest. Edits are a way to polish the overall work.