64-bit can bring huge performance improvements depending on your app and how it's coded. For example, how many cycles does it take to multiply two doubles on a 32bit CPU? On a 64-bit? And I guarantee there are lots of iOS developers optimizing for 64-bit right now.
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And when they optimize their apps for 64bit A7, it means they only sell to iPhone 5S while the majority of iPhone owner stick with 32 bit.
Ain't no smart thing to do for limiting your product to such a small market. To gain most of the masses you need to build for 32bit, and eventually A7 will run it too but as a result it does not really taking 64bit advantages at all.
In short, it's a marketing number to gain for the masses. No real world and practical usage. Not until 3 4 years from now when the majority of iPhones uses 64bit CPU.
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The first 3 iPhones were plastic and no one complained. I really think plastic can look nice and be charming, it just has a bad rep for being so abundant and cheap, the main reason it's so cheap is because it's so useful, functional and in demand.
And so did 3G and 3GS, even Macbook White has so many cracking problems, so many scratches and decoloration.
And so did Steve Jobs decided to replace the backplate with glass on iPhone 4 as it does not scratched or cracked as easily. Just as Macbook white replaced with Al unibody. Problem solved.
So again, yes, it's true .. They used to be plastic, thank God they were not anymore for some time. But several years later they're back again with plastic.
What's with the downgrade?