Natural selection is not like monkeys simply hitting the keys and, if wrong, starting again from the beginning. Selection is cumulative. Once one has made some progress, that stays on as backing for all subsequent tries. And selection does not demand one particular predetermined play, and that the best ever written. In evolution, there is no already-decided end point. Any play will do - an appalling farce, for instance - and all it has to be is better than any rival.