So far I have yet to discover an application that has a 3D touch function which is inaccessible otherwise. For me, the good use of the tech is shortcuts: It is great to force touch fantastical icon and directly create a new event rather than opening the app, going to the correct screen and then tapping the new event option. A lot of features on PCs have discoverability problems, I have, for example, encountered a few people that did not know the Ctrl/Cmd+A shortcut. But such features reward power users. I do not think that we can, at the same time, complain that the applications are getting dumbed down and oppose the additions of advanced, albeit hidden features.
How could I have forgotten that one? you are most certainly right! However, I would argue that this is the one case where there are actually no discoverability problems.
