Reflecting on it now, I believe that metaphors and idioms can help a lot for communicating intuitively and they can convey a lot of information. But at the same time in the situations where a idiom isn't understood by the other, I often have to take a moment to extract the essence of its meaning.
So in social communication, you aren't getting more precise -- in many cases, you're getting less precise and taking more words to handle that. Consider the idiom "shit or get off the pot." You can say that "Make a decision" is less precise. "Do it or don't" is also an idiom but doesn't express the frustration that the vulgarity does. "I am frustrated and need you to either take action or shut up" is more direct and possibly more offensive because it takes formality.
And then there's the prefix of "Sometimes you need to" that turns it from a command to advice. "Sometimes you need to either take action or stop complaining" sounds like the emphasis is on "you" instead of the predicate as if it's a critique of the person, whereas the idiom gives more of a proverb connotation.
The problem is that language carries many layers and "more precise" is a goal in technical communication but neglects the other layers.