> If sales increase when it is thinner, it stands to reason that customers want thinner devices. This isn't something that can be A/B tested when there's only

> If sales increase when it is thinner, it stands to reason that customers want thinner devices. This isn't something that can be A/B tested when there's only one (thinner) offering. People "need" to upgrade their devices and will ultimately buy and put up with the newer model even it means trading a decent keyboard, potentially better battery life, or a headphone jack.