Seems like a simple solution?

Just a modest proposal for replacing the current 3D Touch on Home screen app icons found on the newest iPhones: why not an enhanced long touch? The current problem is that 3D Touch only works on the newest iPhones. What about older devices and iPads? Why not remove 3D Touch from the Home screen altogether and replace it with a long touch? Currently the long touch is just mapped to one function: Managing apps. Seems a waste when that function could just be added in at the bottom of the menu. Am I missing something obvious?