[internals]

3D Touch as implemented is as worrying as the new Apple TV remote - how did it ship like this?

3D Touch edge swipe to app switch overloads back/forward, swipe actions eg Archive or side pane reveal, and iPad app multi-tasking. It's also more difficult than doubling tap Home.

3D Touch text cursor movement is wonderful when it works but iíncreélldibly frustrating when it doesn't. The success rate is not high enough.

3D Touch peek/pop has potential as a new means of interaction. The key to unlock it is solving knowing when you could use it. But 3D Touch is missing on iPads & the SE and implemented completely differently between OS X, iPhone 6, and the watch. Areas you can use it on one don't work on the other. Patterns don't match even between apps on a platform. Throw in confusion with long pressing and what's available in which on what, and you have a proper mess.