I disagree, a script is a great tool, especially if you're not an experienced speaker. You just need to put emotions in it, and know how to act them out correct

I disagree, a script is a great tool, especially if you're not an experienced speaker. You just need to put emotions in it, and know how to act them out correctly, in many ways like an actor. The actor on a stage (or in front of a camera) doesn't react to the audience, but can still tell a compelling story. This takes practice, which takes time. Sadly, too many speakers don't even do a dry run before their presentation.