So an intelligent designer with the consummate skill, vast knowledge, and tools that are totally unknown to us needed to create life over incredibly vast periods of time (if I understand where you are coming from correctly) can’t be bothered to remove genes that are broken (we have a bunch in us) or clean up His designs in general (lots of bad design out there)? He is also limited to reusing existing designs and to just do a make over rather than start from scratch. If you want to limit the intelligent designer to work as humans do then I guess you do have a point. I just can’t see how an actual intelligent designer would ever be limited in that way.