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.