Have you worked most of your adult life, in a laboratory at the world's leading computer and smartphone manufacturer - Apple? Is it your daily task to try out many hundreds of positions on dummies with sensors attached, making close observations and taking precise measurements on many, many different iterations of prototypes? Are you a member of a team of highly talented design engineers, each with a specific skill set, focusing chiefly on that one VERY particular area of the product?
Have you worked HERE?:
https://backchannel.com/what-i-saw-inside-apple-s-top-secret-input-lab-6637e2e5492e#.f5qi6l8ap
Yeah, I'll side with Apple on this one, thanks anyway, but they kinda, sorta know what they're on about, after 40+ years.