Scheme was plenty standardized by the mid-80s when RMS forked (James) Gosling Emacs and replaced its Mocklisp with a real LISP. Very few if any pay attention to the 1990 IEEE standard; for one thing, you've got to pay money to get it (currently $138 for a PDF, $110 if you're a member), vs. the free RnRS series.
RMS could in theory have adopted a Scheme, or even a lexicaly scoped version of mainline LISP, but by then he was so experienced with normal, pre-Common Lisp mainline LISP (Maclisp and Lisp Machine Lisp) I'd wonder if it even occurred to him.
RMS could in theory have adopted a Scheme, or even a lexicaly scoped version of mainline LISP, but by then he was so experienced with normal, pre-Common Lisp mainline LISP (Maclisp and Lisp Machine Lisp) I'd wonder if it even occurred to him.