[kragen]

yes, and i should have said that, but gosmacs didn't copy that aspect of their design, just the ability to extend the editor in (mock) lisp

arguably gnu emacs is almost like multics emacs in this sense; the editing functionality of gnu emacs without any lisp code loaded is not actually zero but is pretty minimal. and i was surprised to find the other day that gnu emacs on my laptop is now compiling all my elisp to machine code, which is another similarity to maclisp, albeit a very recent one