My understanding is that Apple doesnt allow Java ,Silverlight , Qt or any of those, because these platforms could gradually in-signify the need for a walled garden of apps. App Store is a real cash cow with a lot of potential and Apple clearly doesnt want to purge it off(and that is a good business move.)

IMHO, the same even applies to html5. Apple runs huge campaigns and invests in Safari development to make sure that webkit could gradually insignify the need for a plugin to run interactive content. But try running most of these html5 apps on an iphone/ipad.The rendering framerate is very low and is almost not usable. While native apps run real good, the discrimination against webkit could be that Apple is purposefully delaying the iDevice users' dependency on web apps .

I believe Apple's all-control policy is more of a business move than a security related one

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