I think Rich does not like Some x | None because he does not like simple pattern matching too much. This is why Clojure does not have a first class pattern matching syntax (you can emulate, and there is a library and it is just X amount of lines, etc. but still).

In this regard I really like OCaml:

    let get_something = function
      | Some x -> x
      | None   -> raise (Invalid_argument "Option.get")

This is very simple to understand and reason about and very readable. The examples Rich was trying to make in the video I could not tell the same about. He kind of lost me with transducers and the fact that Java interop with Java 8 features is rather poor.