That doesn't matter. People aren't supposed to get an easier to use system after each update. When things change, there's always an adjustment period. After that period, if people are still having issues using the OS, then it was a step backwards. But even if you change everything altogether, put different settings under different menus, different apps do different stuff etc, it still may be easier than before ONCE you get used to it.
I'm not talking about how they organized and grouped the functions and GUI elements. I'm talking about the GUI elements themselves. I think they've gone too far with the flat design.
Forstall might have been a fan of skeumorphistic designs and we know that Ive disliked them, but what's available in iOS7 now is just strange.
People use computers daily. Most iOS users will work in an office environment and use Windows and OSX PCs. Then there are many appliances with user interfaces for everyday life (from ticket machines to TV sets).
All of them usually follow some design rules. They use push buttons to trigger actions, drop down lists to select an option from a set and sliders or checkboxes to turn things on and off. In most cases it's very easy to use those applicances because we've learned what these user interface elements do.
But with iOS they've changed these things. The controls are not clear. Heck, it's not even clear that this image or text is a control at all.
And then there's this inconsistency. Sometimes you slide from left to right, then from right to left, then up and down. But there's no graphical hint for that.
I really think that it's a mess, even if we all can get used to it.