Why is there no 3D touch option in Apple's 6s settings?

Apple 6s can set 3D touch options in two ways:

First of all, the 3D touch option in Apple's 6s settings is in the auxiliary function. The specific setting process is as follows:

1. Open it in Settings-General-Accessibility -“3d touch.

2. Open the SMS interface and click the SMS you want to browse.

Secondly, there is no 3d touch in Apple's 6s settings. The specific setting process is as follows:

1. Of course, for the 3D Touch function, your own application must first support it. Just press the application icon on the screen, and you will see additional function options, just like the option function of right-clicking on the computer.

2. In addition to the icons on the home screen, 3D Touch can also be used in applications, for example, by pressing in an email to open an email preview. In addition, some third-party software has also been updated to support the 3D Touch function in 6S.