a critique of modernism positing the that "melancholy" and disaffection are inevitable end-states, moral relativism and existential crisis finding their origin in the (historical) moment that language comes to be understood as referential, and arbitrary.
To put that in HN crowd terms: it's a look at what happened when thinkers came to understand language as a set of pointers, not values. Benjamin was concerned about what happened to meaning when people understood language as arbitrary glyphs, rather than some kind of metaphysical "synecdoche" which partook literally of the thing referenced, like the Catholic host literally (sic) is the Body of Christ, etc.
https://german.berkeley.edu/news-events/events/on-walter-ben...