I think you're largely correct, but I'd add another point, which is that even if Evans was on the money about why people bought a Galaxy Note a year or two ago, it far from follows that the decision process is exactly the same today.
Someone might have chosen a Macbook in 2006 because they really liked the white plastic, but that doesn't mean that eight years later, they'd be at all likely to buy a new white plastic Lenovo running Windows. In the meantime, they will have acclimated themselves to the platform, gotten used to how it works, come to rely on features that aren't on another platform, or simply not want to deal with the hassle of starting over from scratch with a blank slate device.
Someone might have chosen a Macbook in 2006 because they really liked the white plastic, but that doesn't mean that eight years later, they'd be at all likely to buy a new white plastic Lenovo running Windows. In the meantime, they will have acclimated themselves to the platform, gotten used to how it works, come to rely on features that aren't on another platform, or simply not want to deal with the hassle of starting over from scratch with a blank slate device.