It leaves out the most interesting part of the story.
“Lord, is the theory of evolution correct?”
It is not a bad theory. It is a short-hand that works, but it leaves out the most interesting part of the story. It is like behavioral psychology in this respect.
While Pavlov’s dog salivating tells you something about animal and human behavior, seeing people solely through the lens of stimulus-and-response conditioning leaves out what is really interesting about them. Similarly, the theory of evolution is okay as far as it goes, but leaves out the best part of the story.