Benjamin Santos Genta in Aeon:
When used properly, metaphors enhance speech. But correctly dosing the metaphorical spice in the dish of language is no easy task. They ‘must not be far-fetched, or they will be difficult to grasp, nor obvious, or they will have no effect’, as Aristotle already noted nearly 2,500 years ago. For this reason, artists – those skilled enhancers of experience – are generally thought to be the expert users of metaphors, poets and writers in particular.
Unfortunately, it is likely this association with the arts that has given metaphors a second-class reputation among many thinkers. Philosophers, for example, have historically considered it an improper use of language. A version of this thought still holds significant clout in many scientific circles: if what we care about is the precise content of a sentence (as we often do in science) then metaphors are only a distraction. Analogously, if what we care about is determining how nutritious a meal is, its presentation on the plate should make no difference to this judgment – it might even bias us.
By the second half of the 20th century, some academics (especially those of a psychological disposition) began turning this thought upside down: metaphors slowly went from being seen as improper-but-inevitable tools of language to essential infrastructure of our conceptual system.
More here.