It could be for marketing purposes. 'A novel' in the title might make the book stand out and attract specific readers who are interested in novels.
It might be because 'novel' gives a sense of a complete and substantial story. It sets certain expectations for the reader about the depth and complexity of the tale. Plus, it makes the book stand out among other titles in a crowded market.
Well, it's often to clearly identify the genre of the book. By stating 'a novel', readers immediately know what kind of literary form they're dealing with.
Another reason could be for marketing purposes. A unique and somewhat mysterious title like 'Cloud Atlas' stands out. It doesn't really tell you that the book contains six interwoven stories across different time periods and places. But it catches people's attention and makes them more likely to pick it up and start reading to find out what it's all about.
Some people might say 'no romance novel' because they prefer other genres like mystery or science - fiction. They may find the overly - emotional and often predictable nature of romance novels unappealing.
It could be because a novel offers a more in-depth and complex story compared to other forms of writing.
It could be that the stories haven't been properly authorized for certain platforms or there are technical glitches preventing their availability.
It could be that the rights to those stories are restricted, or there are technical issues preventing them from being shown. Sometimes, they might not meet certain content guidelines too.
In fiction, book titles are italicized to distinguish them from the rest of the text. It's a convention in writing. Italics make the title stand out, showing that it's a separate entity, like a work of art within the story.
Some people might say that because many great novels deal with complex and often tragic aspects of life. These works are often considered more 'literary' and realistic. For example, in 'Crime and Punishment', the main character goes through so much mental turmoil and punishment that it doesn't seem like a happy ending. People who focus on such works may think that truly great novels don't have happy endings as they mirror real - life hardships.
It's often done to clearly indicate the genre and let readers know what kind of story they can expect.