Phone companies copy the best features from each other.
You didn't see apple implementing Samsung's "show your face to unlock your phone" feature because it was kinda slow and dumb. Likewise, I don't see any Android phones with 3D touch.
Yet when front-facing cameras came out, EVERYONE jumped on that feature, now your phone is dead in the water without it.
It was left to the history books the moment other manufacturers said 'meh, we don't need this right now'.
You didn't see apple implementing Samsung's "show your face to unlock your phone" feature because it was kinda slow and dumb. Likewise, I don't see any Android phones with 3D touch.
Yet when front-facing cameras came out, EVERYONE jumped on that feature, now your phone is dead in the water without it.
It was left to the history books the moment other manufacturers said 'meh, we don't need this right now'.