Long-time (25+ years) Emacs user. The first thing I do on a new installation is turn off the GUI features (like, menus and toolbars) - no-one I know who uses Emacs uses the mouse.
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I wonder whether this was intentional or a coincidence, but for others (and maybe you) the "Lisp Machine" was a real hardware architecture unrelated to emacs: https://en.wikipedia.org/wiki/Lisp_machine