As discomfiting as it may be for content creators, a properly-prepared set of visuals for a presentation will fail as leave-behind collateral. Your slides are supposed to be incomplete; they are supposed to be no more than the tease for the words that you will speak. If they say too much, they inhibit your ability to tell the story.
The Design of Everyday Things is a best-selling[1] book by cognitive scientist and usability engineer Donald Norman about how design serves as the communication between object and user, and how to optimize that conduit of communication in order to make the experience of using the object pleasurable. One of the main premises of the book is that although people are often keen to blame themselves when objects appear to malfunction, it is not the fault of the user but rather the lack of intuitive guidance that should be present in the design.
The Association of Psychological Science commissioned a review of the evidence for the benefits of using learning styles, and the report is clear. We conclude therefore, that at present, there is no adequate evidence base to justify incorporating learning-styles assessments into general educational practice.