By using stale metaphors, similes and idioms, you save much mental effort, at the cost of leaving your meaning vague, not only for your reader but for yourself.
George OrwellBut the proles, if only they could somehow become conscious of their own strength, would have no need to conspire. They needed only to rise up and shake themselves like a horse shaking off flies. If they chose they could blow the Party to pieces tomorrow morning. Surely sooner or later it must occur to them to do it? And yet --!
George Orwell