I sort of lost interest in what else the author had to say at this early point, despite having been interested in OCaml for many years. (Referring, for context, to the "Do not make it REPL-centric" comment in the article.)

In Common Lisp, Clojure, Scheme/Racket and Haskell, I constantly develop with the REPL. I also use it in other languages such as Ruby which are not necessarily REPL-centric.

I find that I write much better (less buggy) code, faster, in a language with great support for a REPL.