That joke seems to imply a perfect understanding that it's more than a text editor. It is, however, referred to as "The Emacs Editor" in its documentation and "an extensible, customizable, free/libre text editor — and more" on its official website, which could lead to some confusion about its primary purpose if that's not editing text. I do begrudgingly use Emacs as my main editor because that's what the communities of the languages I like use, but I do find the editing experience to be sub-par compared to other editors I've worked with, and I find that there are better external alternatives to any of the common elisp applications, barring org-mode.