Comment by simply-typed

  sometimes a vector is just a vector, but sometimes it’s a UI component and shows the structure of the UI.

Easily the worst aspect of Clojure. Everything is an untyped map or an untyped vector. Your editor can't tell the difference between a vector of keywords and some DSL for a macro. Things like this make Clojure a nightmare to refactor and scale poorly relative to languages like TypeScript.