Is this story a tragedy or a comedy? Is Mitty simply a daydreamer, or is he suffering from a more serious condition?

There is an argument to be made on both sides of the question of whether Mitty is a daydreamer or is mentally ill. Mitty lives in a world in which he is not able to feel confident or heroic. He perceives his wife as controlling. For example, she requires him to go to the garage to get the chains on his car changed. In addition, the other people around him, such as traffic cops, constantly pester him and undermine him, so it's only natural that he would want to dive into the world of fantasy. On the other hand, you could argue that his ways of coping with reality are not functional and constitute a mental illness. He delves into his imagination, but he does not try to make his life better or happier. For example, he does not confront his wife and tell her to stop pestering him.
This story has tragic and comedic elements. It's tragic that the main character is unhappy with his life and has to resort to daydreaming. On the other hand, he shows inventiveness about his daydreams, and they are quite funny.