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Is that it's not an open platform.
That's an important point to many of us here.
That's true for a computer, not for a consumer device. How many people on Slashdot really care if their home theater systems is open? The same with an iPad/iPod Touch. It's a consumer device for consuming media of all types.
It's not for general computer. It's a media/game machine. Yes, you can try to use it for work, but only when on the train or in the park with the kids.
Let him/her see how poorly you work without music. Miss some deadlines and have lots of shoddy code. Then blame it on the noisy atmosphere and lack of focus-enhancing music.
Maybe there's something wrong with me, but I hate having a clunky phone in my pocket. At work, the phone stays in my computer bag or gets put on the desk. At home it stays in the computer bag or gets put in place where the kids can't get it. But I'm strange, I hate cell phones.
I've marked many a student at my school late because they don't have watches. "I didn't know what time it was. We're not allowed to have cell phones." "Get a watch, then get off my lawn!":-)
I've written 3 rough drafts to children's novels while sitting in the playground watching my children play. I could have used a computer, but than I would have to worry about thieves, sand and rain (I still worried about rain, because I would have hated to get my Moleskin notebook wet). Cursive writing made my writing almost as fast as my thoughts and didn't cramp my hand up.
Don't forget that it would be trivial to show a "virtual" stack with the spines of all the neighboring books. If they can be catalogued and displayed physically, they can be catalogued and displayed electronically.
I loved "researching" by browsing neighboring books in the stacks. But can't this be done electronically? If the book has a library code, then a computer can easily show what other books are in the same section.