So is Apple aiming for a future where you have to buy a new laptop every 2 years to have a machine that is relevant? Or Apple's simply trying to make machines

So is Apple aiming for a future where you have to buy a new laptop every 2 years to have a machine that is relevant? Or Apple's simply trying to make machines that are thin, light, power efficient, sturdy, and reliable. A user-servicable or upgradable machine does not necessarily lend itself to all of those traits. And is a non-upgradable machine that's two years old really irrelevant? That machine could still run Mountain Lion, and could still run all of the apps available on the App Store. It could still play Diablo 3. It could still surf the web. Just because a machine cannot be upgraded to the latest CPUs or graphics cards does not make it irrelevant. And the vast majority of users are often fine with the amount of RAM which shipped in their machines. Quite simply, I posit that Apple could not build a machine like the Retina MacBook Pro if they relied on user-upgradable, off-the-shelf parts. It would necessarily be bigger and heavier, and there's a good chance it'd be less sturdy. It wouldn't be a machine that lives up to Apple's standards.