The power of a metaphor, I submit, is (i) the simplification of a complex idea, and/or (ii) some combination of representative elements that are meant to communicate an difficult meaning in a colourful, easy to understand manner.
In modern media, and common parlance, the use of metaphor seems to be pervasive, to the extent that I wonder if the representational purpose of the metaphor has been supplanted by the metaphor itself, and is therefore evidence of intellectual decay. I do not direct this at any particular nation or group. I observe this usage in a wide range of strata. But then, words themselves are representational in nature, although I think I can fairly say that this latter concern is within the de minimus range and can be igored.
I notice my own increasing use of metaphors and it bothers me, and I include myself in this indictment.