Why has apple not invested time and money into developing one of those pens that can write on an iPad and app to accompany it with an app? I just walked out of a lecture at stanford where nearly every one of us was taking notes on a computer. But I, like many others, value writing AND the ease of technology. So why doesn't apple? Also, maybe they're currently developing what I have described and I have no idea . Thoughts? Ps. I know that there are 3rd parties that make those pens but quite frankly they all suck and I think apple could design a pen 10000 times superior.