Having something visual to look at is valuable, to be sure, and will help ground the discussion and remove potential confusion. But you should show only as much as is needed to get your idea across and help ensure folks are on the same page about what you’d build. That’s it. This might be storyboards, wireframes, or maybe go with high-fidelity videos. But keep in mind: it’s about the change in people’s experiences, not about the change in the pixels.