I've never met someone who doesn't behave this way. Especially the ones who think they don't. We are a product of our experiences, and our expertise is our experience.
> Is there no value in observing human behavior?
The current paradigms of behavioral science aren't the only ways to describe the observation of human behavior. You could in a similar way defend astrology by saying "Is there no value in tracing change over the passage of time? Does the origin of a thing say nothing about it? Is there no value in looking up at the sky, in the stars? Is there no wisdom in the legends of the past?"
The Shirkey principle is not necessarily true, but its a convenient catchall for articles like this one, which expends a lot of words being pithy and appearing clever, but not a lot of words on being right, which makes the reader believe that behavioral science important, without doing any of the necessary work of buttressing the claim with facts.
Behavioral science is very important for understanding e.g. why you can't simply model traffic flow as a fluid, or why you can't simply model economics as a system of oscillators or as analogous to chemical systems. But this article only manages to demonstrate that the author is very smugly self-satisfied, and lacks the introspection to actually chase down and verify their claims.