Why do screenplay writers hate adverbs?

I review screenplays occasionally, and many of them have this annoying feature: they can’t use an adverb.

Instead of saying, “Joe looks worriedly at his wife,” they say, “Joe makes a look of worry at his wife.”

Other variants: “Joe shoots his wife a look with worry on his face.” “Joe’s face shows worry as he looks at his wife.” “Joe’s eyes contain a look of worry in them while he looks toward his wife.”

Sometimes, they won’t even use an adjective. Here’s an example from one I’m reading today: “Joe shows a look of worry.” Not just, “Joe looks worried,” or even “Joe is worried.”

Is someone telling people that this is somehow better – to use six words when one will do as well?