They most certainly do not want you to think of your device as a computer. A computer is the ultimate jack-of-all trades, infinitely extensible in its abilities and customizable to the individual's tastes, style, and workflow. The iPhone in its jailbroken form is just such a machine. It is a fully-capable mini computer with an excellent and extensible BSD kernel.
But that is not what Apple wants. This is why they are so against jailbreaking. They want to determine which functionality your iPhone will have, and they want your interaction to completely passive...that of a consumer. They set the entire UI and allow no customization. You interact with your phone only in ways that Apple decides you can. Apps are like DVDs...they are content that you consume. They cannot interact with the OS except in certain prescribed ways, and private APIs are stricly forbidden. The same goes for videos and music...they are content to be consumed.
Sure the phone is a more complex device than a DVD player, and its apps are more interactive than a DVD menu, but they still want you to accept the iPhone as a device with certain prescribed and limited functions. I would argue that this paradigm is far closer to a DVD player than it is to a computer. To Apple, the iPhone is a platform for consumption of content and services.
I would like to add that your patronizing tone is offensive.
Apologies for the tone - I get that alot.
I think you are wrong.
Although part of the iPhone is a platform for consumption of content and services, most of it is not.
I'm not "consuming" when I write an email.
I'm not "consuming" when I make a phone call.
I'm not "consuming" when I send a text, mms, etc.
I'm not "consuming" when I record a video, edit it and post it on YouTube.
I'm not "consuming" when I snap a picture and post it to Flikr.
I'm not "consuming" when I update my Facebook status or post to a friend's wall.
I'm not "consuming" when I tweet.
I'm not "consuming" when I take notes or create a To-Do list.
I'm not "consuming" when I process a credit-card payment.
I'm not "consuming" when I send a PayPal payment to a buddy.
etc etc ad infinitum
In each of the instances above I'm creating content. In some cases I'm consuming services to help me create content, but I'm not "consuming content" in the way you explained (hence the quotations). DVD players offer 0% content creation abilities, with or without associated services. Even if Apple did intend for the phone to be a platform that's entirely consumption-based, there's still a difference between active consumption and passive consumption. When I play a game, I'm consuming content, but you'd better believe that I'm not being passive. Interface matters when I'm playing a game. It does not matter when I'm watching a DVD. But I'm digressing here...
Back on topic...
You're making an argument that presents Apple as wanting to create and distribute a "limited" device. This seems like the complete opposite of what they've been trying to do. Each software release adds more functionality and each hardware release adds more storage and (recently) faster processing power. This seems alot more like a computer than a DVD player. What DVD manufacturer releases a new player and talks about new UI enhancements, software functionality, storage, and processing power???
You should revisit your thesis. You call the Jailbroken iPhone a fully capable mini-computer, yet the stock iPhone not. That's an awfully razor-thin distinction between calling something computer-like ("infinitely extensible" w/e that means) and DVD player-like.
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