Glenn Fleishman dari TidBITS:

To the first point, the upgrade treadmill, that hits home much more closely to the Android ecosystem, which has multiple manufacturers producing new models seemingly monthly, even though the new models often run older versions of Android that lack marquee features, and older models are often incapable of being upgraded after even a single version release.

Apple, by contrast, has a three-to-five-year window of support for older equipment (iCloud compatibility aside!).