What I miss actually is reachability on my android devices. I use it very regularly on the 6+ & 6S+ that when I go back to using my android I miss it. Oh and force touch cursor for keyboard. That's best use of force touch for me.
Completely agree. I do get a bit of use out of 3D Touch elsewhere on the phone (though there admitted is a learning curve and years of ingrained habits to overcome) but this feature is the most use aspect, so far. I really like using a swipe style keyboard but have forgone using SwiftKey specifically because this functionality isn't available (not sure if it's something 3rd party keyboard apps can incorporate) on anything other than the iOS keyboard. I use it all the time, both to move the cursor and to select text.
I can certainly understand how someone who's predominantly used Android would miss the back button but I also think in
many cases, users who miss the back button the most are those who have generally spent much more time on Android, or started off using Android. I have admittedly spend much more time using iOS than Adnroid but for a good 1-1.5 years straight I used Android phones/tablets (still using an Android tablet somewhat regularly). I'm much the same way that former Android users find themselves reaching for the back button, I often would reach to swipe from the left edge. Does it mean the swipe option is better? No but rather it's what is familiar to me. The back button works great and for the most part offers consisency that the swipe gestures don't have yet on iOS but even after using Android for quite a while, I still found myself occasionally reverting to iOS methods and when I did switch back, never really found myself reaching for a phantom back button.
My feelings about navigating around iOS generally mirror those of Mike. Swiping from the left edge, while still not ubiquitous, is available more times than not in the apps I use. The 3D Touch option to switch apps is great and the 'Back to xxx' touch option when navigating between apps is terrific (do wish it wasn't at the top left corner for one-handed use but I don't use my phone only single handed that often so it hasn't bothered me much--having the function there far outweighs this slight nuisance.
Those of you repeatedly wishing Apple would add a back button need to just let that go--Apple will likely NEVER add that option. Apple would probably love to have as few buttons as possible and they won't be adding a back button...ever. The fact that they have expanded the touch screen options (swipe, 3D Touch, 'Back to' soft key) to meet those needs is all the proof that's needed.