Having a touchbar is 'great' from creating a new interactive display, but it creates additional stress and distractions for our brain. If Apple later on built in a multitouch screen into the large trackpad along with the touchbar, its great that you have 3 displays, and cool that the Macbook Pro has built in iPhone like functionality.. but consider the fact that now your brain and eyes have to constantly shift from the main screen, touchbar, to touch pad. You can't rely on your physical senses to know what you need to touch without stopping you from looking away.
Great on 'cool' factor, but not so hot on reducing distraction. If anything, it's just increasing the number of distractions and the amount of information your brain has to process. Versus just looking at what you want to do on one display, and touching one place directly.