C. S. Lewis couldn’t write a good poem.
Jane Austen had poor grammar.
Tolstoy wouldn’t write poems.
Southey could not write a good short poem.
Hemingway could not write a good short story.
Ray Bradbury couldn’t write a full length novel.
Edgar Allen Poe couldn’t write a happy thought.
J. R. R. Tolkien couldn’t write about anything beside Middle Earth.
J. K. Rowling could only ever write Harry Potter.
Keats never finished a significant piece.
Frank Herbert could only write Dune.
Isaac Asimov wrote limericks in bad taste.
Harper Lee only ever wrote one significant piece.
And I cannot write in modern prose.