In his book Writing Compelling Dialogue for Film and TV Loren Paul Caplin describes the purpose

In his book Writing Compelling Dialogue for Film and TV, Loren-Paul Caplin describes the purpose of his dialogue “toolkit,” thus:

“They are designed to, among other things, raise one’s perception of hearing spoken words. What I call ’ear tuning.’” (Caplin 4)

I had never considered this, but it must be that reflecting different aspects of the world around us must certainly come from the proper training of the apparatus we have for perceiving that world. Apparatus we all use everyday, and so never take the necessary time to “tune,” that apparatus to become more accurate . (This could even be said of the mind, for which we develop heuristics to give us a “good enough,” interpretation of our surroundings.)

So much of being a great visual artist has to do with accurately “seeing,” what it is you wish to draw or paint, so too, accurately “hearing,” is needed for reflecting actual dialog.

Caplin, Loren-Paul. Writing Compelling Dialogue for Film and TV: The Art & Craft of Raising Your Voice on Screen. Routledge, 2020.