Yes, it is a step, but learning the very basics of emacs isn't that hard either. I just cannot bear the view of someone trying to edit Lisp code with an editor without the basic support. This easily leads to all the horror stories you can read on the internet about Lisp :). Also, with Slime you get a great integrated environment. You can evaluate functions directly from the sources. Unless you plan to go with one of the IDEs, Slime is a great Lisp environment. Once you know Emacs+Slime, you won't need any other environment, so why not start with it?
