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Yeah, I can't agree with that. What you're essentially saying is that no organs have a purpose, they're just there and they will do what we ask of them. That's... weird.
Like, our stomach isn't there to digest our food? Our eyes aren't there to see? Our skin's biological function isn't to keep our insides on the inside?
From the completely subjective point of view of humans, those are their purposes.
But biology isn't about human subjectivity. It, as a science, is endeavoring to discuss the natural world objectively. As such, it cannot turn to human ideas of function and purpose, as they are grounded in our subjective ideas about the world.
Do stomachs generally digest food? Of course they do. But to suggest that doing so is their purpose is to suggest that there was a design involved in the creation of a stomach. In reality, the stomach formed merely as a result of natural processes--it wasn't "designed" to digest food, that's just something it does because of the way the organism possessing the stomach interacts with the environment.
My point is that it's fallacious to contribute to that a purpose, which requires intent. An organism might choose to eat, and in so doing choose for their own stomach that primary purpose--that's perfectly fair, because it is acknowledging the subjectivity from the start.
But to claim that it has an objective primary function is wrong.
Let me put it this way, suppose a stomach can either digest food, digest itself, or do nothing.
We say that its primary function is to digest food, because that leads to the health of the animal.
We say that a stomach digesting itself is diseased or stricken with disorder, because that does not contribute to the health of the animal.
We might say that the stomach that does nothing is "dead" or some similar term.
But ALL of these things are chosen because we've subjectively specified one particular end as a good, and are evaluating the stomach in terms of it (the health of the animal).
And that's a serious problem for the integrity of a science, because it not only transposes your personal values onto the subject, but it also declares a sphere of importance for possible functions.