You can't answer a text without dictating or allowing for a simple reply. There are many scenarios where both options aren't available to me and I need to respond back.
Right, that's the point. At this point in my life I'm not going anywhere without a phone by my side. What happens if you feel ill during a run? Well if nobody is around you are screwed. That's something you might take for granted if you run with your phone now.
So in those cases you pull out the phone. I don't really understand your qualms. The Apple Watch from it's first introduction last fall was sold as an iPhone partner, not a stand alone device.
And again, with the running. I run with my iPhone now -- use it as a music player and with iSmoothrun to track my steps, pace, etc. If there is an emergency I can make a call. The watch doesn't change any of that but it does maybe let me free myself of a chest strap. So again, what is your issue here?