Apple's history has a lot of successes stemming from them ignoring stated preferences from customers. Ditching the floppy, a phone without a hardware keyboard, refusing to build netbooks, etc.

As the probably apocryphal Henry Ford quote goes, "if I'd asked people what they wanted, they'd have said a faster horse".

I know those stories, and yet they switched from motorola to intel back in the days, they created a larger screen iphone which proved to be a best seller, and they've recently announced that ios 9 would be a "hardening" release with no major new breakthrough features.

I think we shouldn't confuse marketing studies ( which they may not like), with customer feedback.