Obviously because Apple does not want you to use a stylus with it. Or perhaps, they don't want to be the ones to tell you that you could use a stylus with it i

Obviously because Apple does not want you to use a stylus with it. Or perhaps, they don't want to be the ones to tell you that you could use a stylus with it if you wanted. They want to perpetuate the idea that it's self contained; a stylus would contradict that.