If you’re demonstrating a feature, your audience wants to see the feature in action, not a PowerPoint presentation.
If you’re talking about timelines, then don’t tear apart each individual user story, spending 10 minutes on the ins and outs of each one.
If you’re talking about sales projections, show them forecasts and numbers, not word documents.
Too often we know what our audience needs to see, but we aren’t willing to show it them because we want to show them “how much we know” which is the opposite of what we should be doing. If you show your audience what they need to see, they will know that you understand and comprehend everything.
And if you don’t know what your audience wants to see and you aren’t willing to ask them what they want to see, how can you deliver work for them, and more importantly why are you doing work for them?