>>498 一つの理由を見つけただけですべてを判った気になるな。 ちゃんとそのFAQの最後に、 Because this is a string method it can work for Unicode strings as well as plain ASCII strings. If join() were a method of the sequence types then the sequence types would have to decide which type of string to return depending on the type of the separator. って書いてあるだろーが。
