[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.

[geokon]

Thankfully this hiccup style seems less common in recent code. ie. where the index in the vector has a hidden meaning.. Now vectors are typically used for array of the same datatype. I think this makes more sense as basically if you see a vector, you can shove it in to map/filter/etc.

People now prefer using maps - even if it's a bit more verbose. Not sure why records fell out of fashion. You get the terseness of hiccup and the named keys of maps