Haptic is anything having to do with touch, it's not specifically feedback (although you can tune the haptic feedback of physical devices as well). A handshake is haptic communication for instance.

> They need to be specified precisely because today buttons that don't have any haptic feedback exists.

Again, that's not the case of physical buttons. So you have three categories of buttons:

- physical

- virtual (non-haptic)

- virtual (haptic)

You don't need to specify that a physical button is haptic, it is that by definition. You can discuss the haptic properties (UX) of different kinds of buttons or physical controls, but that's not the subject here.