We don’t recognize things on the basis of useful and functional complexity. We recognize artificial objects based on existing knowledge of the form of those objects (mainly learned via our formative years) coupled with pattern recognition.
Case in point is the iPhone example previously brought up. I don’t need to measure an iPhone’s usefulness or function or complexity. I just recognize it as a sleek black (or whatever color) object, typically with rounded corners and an Apple company logo on it. This, coupled with pre-existing knowledge that iPhones are designed and manufactured by human beings, and voila, I recognize the object as being of artificial origin.
This is what especially astounds me about ID claims is that ID proponents don’t seem to even understand how basic human object recognition works.
This has nothing to do with ideological implications. It has to do with the so-called “design inference” put by ID proponents is usually just meaningless gibberish that has no measurable metrics or demonstrable capability.