Because living animals and other organisms are very complex and delicate (like high-tech machinery), massive random changes will destroy an animal, not give it an advantage.
Many (probably most) evolutionists actually agree and disregard the “saltation hypothesis,” 1 instead saying that evolution works through small changes over time rather than through sudden leaps.
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Dawkins, R. (1996). Climbing Mount Improbable. New York: Norton.
- Dawkins, 1996, p. 98: “Evolutionary theorists have sometimes suggested that major saltations are incorporated into evolutionary change in nature. … But Goldschmidt’s theory has never been widely supported, and there are general reasons for doubting whether macro-mutations or freaks really are important in evolution. Organisms are extremely complicated and sensitively adjusted pieces of machinery.”
p. 91: “The message from the mountain is threefold. First is the message we have already introduced: there can be no sudden leaps upward–no precipitous increases in ordered complexity.” ↩