A smarter design exists. Pigliucci offers a picture (in Denying Evolution) where an optimized human design is offered for our environment. - Unfortunately, life has one general basic set of designs, which results in having to use what is at hand, so we cannot actually re-invent the wheel of life any time we wish, and these arguements are always used to say there is no designer, as 'I can do it better than He did'.