Why are Apple's products so confusing? They ignore design principles

Don Norman for LinkedIn Pulse:

Apple has gotten carried away by the slick, minimalist appearance of their products at the expense of ease of use, understandability, and the ability to do complex operations without ever looking at the manual.
Today, the products are beautiful, but for many of us, confusing. The fonts are pleasant to the eye, but difficult to read. The principle of "discoverability" has been lost. The only way to know what to do in many situations is to have memorized the action. The screens offer no assistance in remembering whether one should swipe left or right, up or down, one finger or two. Or three. One tap or two. I frequently have to "re-read the manual," which means going back to the control panel to review the multiple finger swipes -- which are not even the same for all devices: the magic mouse is different from the trackpad which is different from the iPad.

My only question: Shouldn't design principles change considering 8 years back we only had the desktop and the web that we interacted with a mouse/stylus and keyboard?