Asteroid City is a perfect picture in the sense that it defies a summary in any other medium. It is expressed most efficiently in the medium of its choice.
The best way to paint the Grand Canyon is not to try to paint the Grand Canyon. The best way to paint the Grand Canyon is to paint the abstract idea of the Grand Canyon. So it is with all objects of great complexity, including the life itself. One gets closer to the real thing by staying back a little and cultivating an optimistic perspective.
To live is to compose, to write, to act, to doubt, and to rehearse; and to rewrite, to play, to be fired (mostly unbeknownst to one), and maybe to catch one's lucky break. Perhaps this is why movies about movies and plays about plays endure. Life is a play within a play within a dream. Or some permutation thereof.