"intelligent design" starts at least formally from consideration of scientific evidence

You legitimise it too easily. Intelligent design pretends to "consider" scientific evidence, but it doesn't really. It plucks examples of what it views as irreducible complexity (which are never true examples) and invests them with completely unscientific notions. Darwin anticipated this and dealt with it beautifully and comprehensively (with a gently fatal blow), but, of course, that isn't the kind of evidence that intelligent design merchants want to hear about. Intelligent design is the pseudo-intellectual wing of creationism, no more, no less. Two cheeks of one rather smelly arse.