I don't understand the extremely strong aversion to touch ID on the back of a phone, especially when it gives you more screen real estate on the front of the phone in a much smaller footprint. Every once in awhile, I see a post on Macrumors making this very point with little recognition but otherwise there is almost universal opposition to the idea. Why take away the physical home button if you're going to replace it with a lame "touchbar" design which reduces actual usable screen space from 5.8" to 5.1"? I fail to see the logic. And if you are unable/unwilling to use the back touch ID, you are probably going to have the option of iris or (less secure) face recognition. I would think most iPhone users could adjust to a format many android users have been using for a year. I suspect on some level the idea of moving it to the back is offensive simply because Apple didn't do it first and these android makers stepped out with the new design first. Kind of like larger screens (and yes, I remember laughing at and ridiculing the first Note device myself).
This schematic, while ugly on the back, actually makes me more, not less, interested in the new flagship iPhone. I have used the Plus model phones for almost 3 years now and I'm not interested in less usable screen space.