This what I've been saying for years, now.
Apple have been dragging the entire industry down the wrong road in interface design.
Microsoft, who are legendary for lacking any form of imagination have been aping their ethos, which has led to the disastrous Win8 UI. It only works well if you already know how to use it. From my many years of working in the IT industry watching users painfully navigate various UIs, there is no uncertainty that this is the wrong approach.
A good example of this minimalist ethos gone wrong is win8 swipe in from the edge of the screen. It's actually really useful, and quick way to access options and switch between apps, but, guess what?
There are absolutely no clues, visual or otherwise, to indicate that this is something you can do! I've been using computers since I was 5 years old, and when I got hold of my first Win8 fondle slab, it took about 10 minutes for me to discover that feature.
If it took me 10 minutes to find it - by accident, then my grandma has no hope at all. Ever. I was overjoyed when touch screens started to become common place, along with powerful 3d graphics capabilities. The UI designer in me knew this was a huge step forward in intuitive design, but then Apple decided to take a huge step backwards, and being flavour of the month, everyone else did, too.
It was like the emperors new clothes. Microsoft threw away the transparencies in Win7. An idiotic move. Transparencies allowed you to see that there was another window or box behind the one you're looking at - a genuinely useful UI feature on the cluttered desktop of a busy days work. The 3D effect and drop-shadows aren't just there to look pretty and waste resources, they are visual clues to indicate at a glance which window is on top, and which is selected, and they work intuitively, because they mimic visual clues we use in the real world to perform the same visual identifications.
Then there was the loss of one of the greatest UI helpers of all time. The roll-over. This is more due to the change to touchscreen, but the Apple ethos didn't allow for any means to compensate for its loss.
I can't emphasize strongly enough how important the roll-over was. If you weren't sure that "thing" on your screen was actionable, you simply moved your mouse pointer over it. If it was, either it, or your mouse pointer would change.
This was so fundamental to our learning of new UIs, the loss of the roll-over should have prompted the entire industry to frantically come up with new and different visual clues to aid the touch screen user, and initially, we did. But then Apple decided it was too messy, and besides, everyone now knows how to operate touch screens, so let's throw all that junk away.
And like idiots, the rest of the industry followed.
Well, here's the thing. The rules haven't changed, because you're still designing for human beings. If it's supposed to be a button, then make it LOOK like a button. You have to give them clues that they're supposed to press it, and that they have pressed it successfully.
Don't just assume the user already knows how to do it. Right, I'm off to clumsily fumble with a Samsung monitor trying to switch it on. Now, is that power symbol on the front a touch screen style button, or is it to indicate that there's a mechanical power on that edge. Or on the back? And is there a second mechanical switch hidden somewhere I have to turn on before I can...