Evolution doesn't work towards an end goal like that though. There are plenty of attributes we have which are sub-optimal. For example our eyes have a number of significant flaws many of which are not present in other, arguably inferior, species to ourselves.

You'd probably have a stronger case if you argued about natural selection instead but given the history of humans, it's hard to believe that many would reached the end of their natural lives before getting killed. Certainly not enough and over a long enough period for immortality to have come about.