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IDGI... Why are there "missing" apps from the iPad? Why no Weather, Calculator, etc?
Even Mac OS X comes with a calculator...
Apple has never commented. However, Gruber did mention something about it when the iPad was introduced:
"It's not that Apple couldn't just create bigger versions of these apps and have them run on the iPad. It wasn't a technical problem, it was a design problem. There were, internally to Apple (of course), versions of these apps (or least some of them) with upscaled iPad-sized graphics, but otherwise the same UI and layout as the iPhone versions. Ends up that just blowing up iPhone apps to fill the iPad screen looks and feels weird, even if you use higher-resolution graphics so that nothing looks pixelated.
So they were scrapped by you-know-who. Perhaps they'll appear on the iPad in some re-imagined form this summer with OS 4.0, but when the iPad ships next month, there won't be versions of these apps. At least that's the story I've heard from a few well-informed little birdies."
http://daringfireball.net/2010/03/iphone_apps_on_the_ipad
So, Steve Jobs didn't like the blown-up "widget" apps.
Apple will eventually do something about the lack of Stocks and Weather apps since they are now a feature of iOS 5's notification center.
Would think it has something to do with their rule about not having apps that are the same as what comes with the OS. I think it is part of why you download iBooks separate.
The apps in question are part of iOS. They ship with iOS and are not updated outside of iOS.
The primary reason the iBooks.app wasn't included in iOS (like Weather, Stocks, etc) was because it could be updated faster outside the OS.