I don’t think just anyone write a book- both poetry and prose are art forms in themselves. Both take a lot of work to be well written, understandable. Both poetyr and prose are beautiful art forms, and either type can be vague or easy to understand.
I wrote poetry when I was younger, including lyrics. However, as I got older, I began to write stories more. For me, poetry was simply a different type of expresssion. Even though I don’t write poetry now, I do love to read it.