One of the dynamics is that if there is too much text they’ll read instead of listening to you. Another is that if the conclusion is on the deck, they’ll get bored waiting for you to get to the punchline they’ve already read, and that can lose your audience as well.

So you’re better off either opening with the conclusion or putting it on the next slide, but accidentally jumping two slides forward can still ruin your audience’s attention span. So sometimes it’s better for it not to be in the deck at all.