I realize this is sort of like yelling at the wall but why "Reachability"? Pulling down the whole screen and losing content when they could have gone with an adjustable scaling like the "One Hand Mode" that Android has. I'm guessing it comes down to not wanting to do it the same way but it makes so much more sense. You could scale down to the 4" screen we're used to or anything else. I really hope this argument is brought up and maybe allow for scaling/adjustments to be made by the user and not just shove it all down. (not holding my breath...)
Reachability
One Hand Mode
Reachability
One Hand Mode