Mostly, movies are designed for a broader demographic. A screenplay works via a different dynamic than a novel. The wording in a script should be impressionistic, not realistic. A screenwriter must not generate too many details. Details bog the read down.
Details make a screenplay too dense.
Scripts have to be quick reads . . . A good screenplay is not wordy, i.e., it's not about the writer's vocabulary. A dramatic story creates a bond with its non-reading audience via the manipulation of emotion. Most screenwriters struggle to deprogram their over-writing per all they've learned in other formats, i.e., short story, novel, school essay. Therein, the best advice for a novice screenwriter is to read scripts.