you don't get a 2nd chance to design an API I think that is exactly the author's point, at least if you think that the best way to get to the Right API is to "

you don't get a 2nd chance to design an API I think that is exactly the author's point, at least if you think that the best way to get to the Right API is to "think about it really hard" instead of "write a bunch of crappy prototypes".