> I just can't consistently control the phone. A large percentage of taps or swipes do things I did not intend (how many I'm not sure -- 20%? 33%?) It's just completely crazy.

I couldn't agree more with this. Just as bad (if not worse) on Android. I can't seem to use any modern phone without a huge number of unintended inputs. The reliance on gestures in apps is especially annoying because I don't use some of them often enough to memorize the different gestures. I very often just get stuck in various apps tapping and swiping randomly trying to make something happen. Just the other day I finally figured out when I get stuck in Instagram I can tap the Instagram logo to go back. Up till now I've been force quitting it instead.