There were Lisp systems that were simpler than Unix, such as AutoLISP, Scheme, and later XLISP, but the ones that were competing with Unix in the 1970s were things like MACLISP, Zetalisp, and Interlisp, which were much more complex than Unix was at the time. I mean, Zetalisp had its own microcode, its own hypertext documentation, its own GUI, transparent persistence, and a WYSIWYG text editor, at a time when Unix had a couple of C compilers, man pages (its own typesetting system, to be fair), @ and # as the defaults to erase a line and a character, and ed as the standard text editor.
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There were Lisp systems that were simpler than Unix, such as AutoLISP, Scheme, and later XLISP, but the ones that were competing with Unix in the 1970s were things like MACLISP, Zetalisp, and Interlisp, which were much more complex than Unix was at the time. I mean, Zetalisp had its own microcode, its own hypertext documentation, its own GUI, transparent persistence, and a WYSIWYG text editor, at a time when Unix had a couple of C compilers, man pages (its own typesetting system, to be fair), @ and # as the defaults to erase a line and a character, and ed as the standard text editor.