I think having to to divide the language into two semantically exclusive sublanguages answers the question of the author. (Though the title here is not his tit

I think having to to divide the language into two semantically exclusive sublanguages answers the question of the author. (Though the title here is not his title...) The other answer (which there was an article about a few months ago which was posted here) is "Because having exceptions is really complicated when certain object actions can't throw exceptions."