An anonymous reader writes: Apple's new Retina MacBook Pro is essentially completely non-upgradable, a sealed-box, following a trend started with the MacBook Air in 2008. It's a given that hardware companies are in the business of selling hardware, and would love for computers to have iPhone-like replacement cycles of 1-3 years, but does this mean we're moving irresistibly into an era of "sealed-unit computing," even for power users?
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