Keeping things vague for a purpose and being unclear about what to say are two different things.

At the end of a movie, when emotions are already running high, a great line of dialogue can feel like a force of its own. “That’ll do, pig,” from Babe (1995) is one of the finest examples of this.

In the world of fiction, dialogue is the lifeblood that pumps through the veins of every great story. It’s the invisible thread that weaves characters together, propels plots forward and breathes life ...

The vast majority of scripts contain dialogue. It's likely therefore that your (yes, you, reading this - your) script contains dialogue, too. Now, of course, some actors are prone to ad libbing around ...