From an engineering and design company perspective it’s full of problems. Our spinal cord for example makes no sense unless you understand it to have originally evolved to be used walking mainly on all fours. As it is now it focuses all this immense weight all into this one vertical pole. It’s why we as humans have such a wide variety of back problems other mammals just don’t. How could you argue something like that was intentional, when no rational person would ever design something that way if they were starting from scratch?