Drama, poetry, and the short story are all genres of literature that rely on exquisitely careful word choice.
Drama, as a form, is written exclusively as lines spoken by different characters. These lines generally don't hold any unnecessary or superfluous verbiage, or else the power of the dialogue is compromised.
Poets, while writing poetry, are often encouraged to examine their own work line by line, and each line must be able to stand on its own. Filler material simply cannot exist in poetry, or else the beauty and the meaning of the language becomes diluted in the excess language.
As well, a successful short story, as a brief expression of a story or narrative, benefits from a very discriminating editor. The form cannot afford excessive descriptions and lengthy paragraphs as even its name insists that, as a form, it must be "short."