Upgradeability is, again, not something the general public cares about. It seems you are down-playing how the rMBP functions out of the box. I have one significant design complaint, they did not use a 'dedicated' graphics card and that is a sin for a "pro" laptop. Means we won't be using them for our mobile 3D CAD workstations (probably have to keep using HP EliteBooks).
Apple offers battery replacement service for all their non-user-replaceable batteries. Most reports claim this is a relatively painless process, aside from the time without your device, waiting for the service. More intrepid techies, armed with spudgers, do replace their own.
I have not had a need, in general, to upgrade laptops. Do you? If so, why? After about three years I find it is more effective to replace a laptop, restoring the factory image on the old one and selling it on Craigslist if it still functions. If you travel enough with typical business use, laptops do not last forever. Screens/mobo's/hinges crack, solder joints fracture, keyboards get messed up, trackpads wear grooves, etcetera.
I do get that if your priorities are different then Apple products can have a lower value to you. But then you'd have a biased view of Apple's financial future because your use case is different than most. The general public is who makes or breaks big-volume electronics, not the extreme cases than most techies represent.
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