evolutionary trees are littered with branches that have thus far been unable to overcome local maxima- Our eyes' retinas for instance, have optic nerves that c

evolutionary trees are littered with branches that have thus far been unable to overcome local maxima- Our eyes' retinas for instance, have optic nerves that connect on the light sensitive surface, blocking a huge portion of valuable photons, instead of the logical place to connect them- on the REAR of the retina- as squid and octopus retinas have been connected in their completely independent eye evolution. Once something works "good enough" there's not really any selective pressure to eliminate obvious design flaws if they don't particularly impede reproduction or survival.