You can switch between Apps by hard swiping from the left edge. You can move the cursor and make text selections by hard pressing the keyboard. You can preview links in safary without having to long press. You can open additional options in control center (flashligh brightness, timer duration etc). You can hard press a song, and without lifting ur finger select what you want to do with it in less time than the newer models take to even show u the dialogue.
I am not certain but I think 3D touch referred only to touching app icons and opening a menu which you can still do but it is no longer as feature rich if the app supported it. All the other features you've listed are still present in newer phones.
ahakki|5 years ago
3D Touch was a great feature.
tarentel|5 years ago