Most scripts are written to be green lit. They're not written to be acted. And a lot of writers with the greatest intention in the world don't write for actors. They don't understand the architecture of what an actor needs to get from point A to point B.
I am very aware that playwrights, particularly good ones, have a intention for everything they write. Language and punctuation is used specifically, and most of the time actors can find wonderful clues about character in the rhythm and cadence of the language used.
At school I was always trying to con my teachers into letting me act out book reports instead of writing them.