See it in action:
http://appadvice.com/appnn/2013/06/slide-to-unlock-appadvice...
I get the desire to eliminate depth, but that little slide gutter and right-pointing arrow tell you exactly what you need to know. The iOS7 UI instructs you to do the wrong thing!
The presence of the up arrow is actively misleading, from a UX perspective. It's like having a slide toggle that you have to double tap to activate!
Few people read user manuals, which Apple knows. It doesn’t even ship a physical user manual with their iOS products (just a thin quickstart guide). There are in-depth user manuals available for download[1], but the percentage of iPhone owners who read it must be negligible. I often meet iOS users who don’t know that double-tap on the Home button brings up the app switcher.
As the OSes on these mobile devices become more capable over time (and the interaction model grows more complicated), users may need to start treating them as computers that require learning beyond trial and error.
Especially because there is no reason to drop the visual slider, or to make all the visual hints on the screen super low-contrast (on the new starry sky background at least).
Unfortunately, in my experience so far, this isn't the only case of misleading and unintuitive design in iOS 7.
And why on earth do people assume Apple hasn't thoroughly tested this? They may get many things wrong, but it's insane to thing they overlooked that part.
Any thoughts as to why they did that differently? Am I just totally off base?
No, you're not using the right lingo. If it's Apple, they do not throw away; they "evolve". They also do not copy, they "refine the experience".
edit: I guess it seems obvious now...
The thing that stood out the most for me was slide-up to unlock, that's been a Windows thing since they began their redesign with WP (from WinMobile).
Still I think that somehow Apple did a better job with the flat UI, I'm currently using Windows 8 (by choice) and my phone is a Lumia 521 (again by choice), and I always feel that something is off with the WP/W8 buttons, they just seem too flat or too... just off -- I can't explain it but I get this weird feeling everytime I see them, the buttons and controls just don't feel polished enough.
When I first installed W8 on my laptop, I thought it might be because it's a beta product and not finished, then when they shipped those icons, I thought it was just my screen (my laptop is a four year old dell inspiron that shipped with vista, incidentally it runs W8 better than it did W7, and better than vista before that), but now that I have a new smartphone the niggling is justified -- there is something odd about the buttons, especially when compared to the new iOS7.