Speaking as an app developer, the little-known nature of 3D Touch means we can never rely on it as the sole way to access a feature, and that pretty much always means we have ignored building much with it.

I wonder if better training by Apple could help? But it seems they’ve already accepted the tap-and-hold workaround for supporting some 3D Touch functionality on devices without 3D Touch.

Seems like 3D Touch, and iOS 7’s lightboxing parallax effect for backgrounds, was likely part of a broader vision by Ive and the design team to bring depth to a thin phone screen. It’s an admirable goal, but whether by lack of discoverability or lack of training, seems like it isn’t poised to be a widely-adopted technology.