I thought that the separate name was a little strange too. I thought at first it meant there wasn't feedback, but then they showed it did...
There must be something different enough between them that they see them possibly being used differently in the future that they wanted it to be distinct.
Gary
I haven't usted and Apple Watch so Correct me if i'm wrong bit I believe you Only have the option to touch and fource touch on the Apple Watch, 2D. On the iPhone 6s you can touch, peek and touch harder flor a 3rd acción, 3D touch.