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@amszmidt @jtr After working for almost three decades with Emacs, I only stumbled over XEmacs and GNU Emacs.

I've never stumbled over your other examples. Emacs might be a niche on its own, yes, but your examples don't even qualify for a niche worth mentioning IMHO - at least what their practical impact means. YMMV.

Emacs is a Lisp platform, no editor (only). I'd love to see your reference from the creators or Emacs. Might be a definition from the 70s/80s where this might have been correct.