Portable Standard Lisp has fewer features than other Lisps, such as Common Lisp, and some people found it unpleasant to use. Richard P. Gabriel wrote in his popular essay Lisp: Good News, Bad News, How to Win Big,3 "the third most standard Lisp was Portable Standard Lisp, which ran on many machines, but very few people wanted to use it;".
Gabriel, Richard P. (May 1985). Performance and evaluation of Lisp systems (PDF). Cambridge, Massachusetts: MIT Press; Computer Systems Series. pp. 75, 294. ISBN 0-262-07093-6. LCCN 85-15161. 0-262-07093-6 ↩
Gabriel, Richard P. "Lisp: Good News, Bad News, How to Win Big". Dreamsongs. Retrieved 2019-04-25. /wiki/Richard_P._Gabriel ↩