I see. So I just have to design the wheels accordingly and I'll have myself a nested hierarchy by intelligent design.
of course. Nobody's saying an intelligent designer
can't design a nested hierarchy, rather that an intelligent designer doesn't
have to do so. They could design in any manner they choose. And in fact would not do so by nested hierarchy because it is neither the most efficient nor effective way of designing things.
Evolution, on the other hand, pretty much necessitates a nested hierarchy. And because a nested hierarchy is a specific requirement of evolution, and not any sort of requirement at all for an intelligent designer, the fact that life is in a nested hierarchy more strongly supports evolution than intelligent design.
Consider it this way. You have two chefs willing to cook a meal for you. You go to Chef A and tell him you want a pizza, 12" in diameter, with pepperoni, mozza and cheddar cheese, ground beef, hot peppers, mushrooms, and pineapple. You go to Chef B and tell him he is free to make you whatever meal he wants.
The first meal comes out, and it's a pizza, 12" in diameter, with pepperoni, mozza and cheddar cheese, ground beef, hot peppers, mushrooms, and pineapple.
Which chef made that meal? Certainly it could have been either, but the specific requirements made of Chef A definitely point to him being the one who made the meal.