For Janestreet? Definitely. If you do Ocaml, you do emacs, if you do emacs, you do GNU (or some other sane unix). Anything else means you're stealing your own

For Janestreet? Definitely. If you do Ocaml, you do emacs, if you do emacs, you do GNU (or some other sane unix). Anything else means you're stealing your own or company time. > a trivial difference in opinion about UI efficiency. That's one way to look at it. Another is that the quest for UI efficiency is a timesink and an upgrade threadmill susceptible to fashions. The counter to that is to learn it once, learn it well, and be done with it for the rest of your career. Emacs fits that profile just about perfectly.