There are a lot of things which didn't fit in my book. (And which might have made it better). Some of them because I couldn't quite work out how to make them fit or make them settle. This thought about the difference between short stories and novels is one of them. By Louis Menand from the New Yorker of 5 July 2021:
"Short stories are more like poems than like novels. Novelists put stuff in, because they are trying to represent a world. Story writers, as Poe implied, leave stuff out. They are not trying to represent a world. They are trying to express a single, intangible thing. The story writer begins with an idea about what readers will feel when they finish reading, just as a lyric poet starts with a nonverbal state of mind and then constructs a verbal artifact that evokes it. The endings of modern short stories tend to be oblique, but they, too, are structured for an effect, frequently of pathos."
I think a good presentation is a bit like that, except it's trying to express a single idea. And possibly lead to a change or an action.