What you call "dedication to usability" I am more apt to label "dedication to user interface". There is an important separation of meaning there.
The technology learning curve is less steep with an Apple product, but the capabilities of the device eventually hit a wall, unless you are willing to undertake the additional effort of learning to jailbreak. Competing devices have a steeper learning curve, but they go all the way up to the hardware ceiling without such a big discontinuity. Rooting or re-flashing an Android device is still a leap, but it is much less of a shock to someone who has gone to that point. In comparing Apple and Android devices, I'd say that stock Android is more capable, but Apple is more user-friendly. Carrier-crippled Android devices reduce the functionality to that of an Apple device or less, without the mitigating factor of the superior user experience.
It turns out that doing all your user hand-holding with soft, warm hands has significant market value.