I have tiny hands, so I’m all for Luke Wroblewski’s call for placing navigation at the bottom, especially when a handheld is any larger than an iPhone 5.
I do like the big screen on my iPhone 6 — I wouldn’t trade it in. But I find myself doing this “crawling up the phone” action to reach the navs on so many apps, and then I end up dropping the phone. Bottom navs for one-handed use would make my life a lot easier.
“Finger Crawling” up the sides of the phone to reach the hamburger menu:
Using my pinky as a tray to hold the phone so I can reach the home button: