Can seem to be another way of getting a section of people accustomed to living without 3D Touch for one or two weeks. Their next iPhone is not going to support 3D Touch if their current one does, and this week-long or fortnight-long training will help.
On that subject, I have grown accustomed to using 3D Touch on the keyboard to navigate the cursor between characters and words. Sometimes, my finger obstructs the view if I want to pick the cursor and drop it anywhere else as I would have to do on newer devices.