Absolutes are almost always wrong. “Never say never,” as people will always find a way around it or an extreme exception. Here are a few to think about. And yes, I have seen them all. Never?
Never simply copy text from a document as your message (p1)
Never write the slides before planning
Never give a presentation without a message
Never put up a picture of an article
Never use more than one image on a slide
Never use subscript for a reference.
Never present to an audience in edit mode
Never present facing the slides
Never read your script
Never say never.
Now, as you attempt to justify any of these in your practice, please ask if you are arguing from a position of “everyone does it,” or science. The former is never an acceptable reason.