Why were Franz Kafka’s novels The Trial and The Castle published unfinished?

Franz Kafka’s novels The Trial and The Castle were published unfinished because the author died in 1924 before completing them.12

Prior to his death, Kafka suffered from significant misgivings about his work and left instructions for his friend and literary executor, Max Brod, to destroy all of his unpublished manuscripts. Brod, however, chose to defy these wishes, believing the works were of great importance. Consequently, he edited and published the manuscripts posthumously in the 1920s, ensuring that Kafka’s literary legacy survived despite the author's original intent to have the materials destroyed.23