But (Gnu) Emacs is not a plain text editor. It can edit formatted texts, embed pictures and widgets etc. While XCode's editor, even if I haven't seen it in prac

But (Gnu) Emacs is not a plain text editor. It can edit formatted texts, embed pictures and widgets etc. While XCode's editor, even if I haven't seen it in practice, most probably actually is. So it can't be the "plain text editor" aspect that is the differentiator in favor of XCode here.