Pardon my blunt talk on this topic. Preparing slide presentations is NOT work! Your company does not sell presentations, but instead sells a product or service. Slide presentations only produce the appearance of work.
The ONLY use of slide presentations is to educate a cast of idiots, usually holding senior leadership positions, and usually to justify some other stupid thing they want to do. It’s an activity they would find unnecessary if they only got out of their chairs to walk around the factory or office floor once in a while!
If you want to know why workforce productivity is low, or barely climbing these days, ask yourself if your people are producing presentations, or if are they producing your company’s product or service.