While I will miss 3DT full functionality when I update to the next iphone, I hope apple has some good use for the space they saved. Other than to save a penny or two.it offered GREAT tangible and efficient benefits:
accurate mouse/pointer control for text selection and insertion between letters. magnifying glass was getting too long in the tooth.
Peep n Pop - like the TouchBar without useful applications of the tech, and much like BlackBerry/RIM of old failing to advertise technology means nobody is aware of it.
.3/5mm drop in screen thickness will barely amount to 1mAh of battery storage increase. Apple just is pinching wherever it can to save a buck/unit. OLED surely can implement 3D Touch.