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Apple crushes creativity and its reputation in new iPad ad
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's because they're trying to instill in your mind that you're getting into an ecosystem. A way of life, even.
"XYZ on the iPhone" just makes it sound like an appliance.
"XYZ on iPhone" makes it sound like it's an ecosystem. An experience. Something to be part of.
It's a very deliberate (though subtle) marketing choice that I believe impacts how people view the brand.