This article misses the point. The Fibonacci/factorial calculations are just toy examples to easily illustrate recursion to a beginner. Nobody who actually need

This article misses the point. The Fibonacci/factorial calculations are just toy examples to easily illustrate recursion to a beginner. Nobody who actually needs to compute them for a real application would think that these inefficient, merely pedagogical examples would be the way to do it; Lisp hackers would have no problem using the closed-form solutions.