The bad idea is Leave yourself out of your writing
The author say it is bad idea because the reader is connect to the writer, when you take self out of your writing, you would’t better show your purpose and difficult to catch reader’s attention. Also, the audiences can’t better to learn something, they might think it is boring.
A better idea is before you write something, you need consider few points. For example, how would you catch the attention of readers, make them feel interest. Also, using own life experience to strengthen your main idea, it can make audiences more clear about your writing. Moreover, encourage readers to rethink or reimagine what they may already know through reflection and action.