1) make the presentation interesting to sit through
2) have something that you are convincing the audience to do, you should be telling them to "do X" not just tell them "about X".
Whether you have page numbers (I don't) or builds (I do) or executive summaries (I don't) is not going to meaningfully add to the chances of your presentation landing.
Structure is key. The "Tell ’em what you’re going to tell ’em; then tell ’em; then tell ’em what you told ’em"[1] method works well.
The Duarte Method's[2] "Big Idea"[3] is a good approach:
> A big idea is that one key message you want to communicate. It contains the impetus that compels the audience to set a new course with a new compass heading.
Presentations without a key message are just somebody standing there and talking at you.
[1] https://quoteinvestigator.com/2017/08/15/tell-em/