Clojure's stdlib is unintuitive, and `into` is the poster child.

It's easy to find what's available in Ruby: https://ruby-doc.org/core-2.5.3/Enumerable.html

Good luck with Clojure: https://clojure.github.io/clojure/clojure.core-api.html

https://clojuredocs.org/ is what I always used. I dislike ruby's docs actually. Rust and Crystal have better UX design for their docs.

https://re-find.it ?

I'm talking about the flat namespace.

While I understand the sentiment that all the functions aren't necessarily grouped as in OO languages, I think the Clojure functions are harder to group because they're more general. That's not necessarily the strongest argument, but it is so much more obvious in OO because you always have the object to group by compared to functional languages.