Ok, that's pretty cool. Still doesn't seem as supported by the core APIs though. In Emacs I can run a REPL and attach it to any process with a few lines of code

Ok, that's pretty cool. Still doesn't seem as supported by the core APIs though. In Emacs I can run a REPL and attach it to any process with a few lines of code. I love Sublime Text, but I would argue that Emacs is more extensible in all sorts of places where it really matters.