> When you treat it as 'just an editor' you're working against its design rather than with it.
No. This is exactly the sort of talk that turns people off from Emacs. You can use it as "just an editor." Indeed, read the GNU Emacs Manual. It almost entirely describes "just an editor." An excellent editor. The user needs to consult the Emacs Lisp Reference Manual only if extending Emacs is desirable.
Comments like this one suggest that Emacs is designed only to be programmed and that if the user does not program it, the user is "working against its design." This is just as false as saying that a Vim user who writes no VimScript is working against Vim's design. No, the user who doesn't program the editor is...using the editor. As designed.
> You can use it as "just an editor."
You can, sure - sometimes we all do, when we need to debug a faulty package, we run it with the -Q option. I've been working for many years with people who use Emacs, have many friends who use Emacs, have mentored complete newbies and regularly discuss advanced topics - I have yet to meet someone who uses Emacs as is - with no customizations whatsoever. In fact, if I meet anyone who does that, I would very much be interested in learning their rationale, and perhaps even try to question their mental or emotional state.
Vim on the other hand, is very different in this, there are in fact plenty of users who do use it with zero customizations, daily.
> read the GNU Emacs Manual.
Okay. Let's do it... M-x info-emacs-manual - the very first two sentences - "Emacs is an advanced, extensible, customizable, self-documenting editor. This manual describes how to edit with Emacs and some of the ways to customize it." The third paragraph right there, at the very top, already explicitly says: "For information on extending Emacs, see Emacs Lisp". Five words pertaining extensibility in just three opening paragraphs, against only a couple of cognates of "editor".
What the heck are you even trying to argue here? Rephrasing your point doesn't change the underlying fact - Emacs is first and foremost an "extensible editor", not "an editor that can be extended (if desired)" - the emphasis is on "extensible", not on the "editor". That's what sets it apart from literally any other tool that gets used as "just an editor".
If regurgitating the factuality engrossed in the manual, ardently or otherwise, turns some people off from Emacs - so be it, like I already said before - it's probably for the best. Better for them, better for the Emacs community.