The new touchbar MacBook Pro approaches the old MacBook Air in footprint and weight and takes design cues from the ultraportable MacBook. Everyone's ideal would be to have "desktop" power in a machine the size of the MacBook or lighter, but that just isn't available today. So setting power aside: Where can you take your MacBook that you can't take the touchbar (13 inch) MacBook Pro? What can you do with your MacBook that you can't with the touchbar 13 inch MacBook Pro? (one-handing it? using it on the lap in a train? on a plane? a bus? a car?) What are the limits of portability of the new touchbar MacBook Pro versus the retina MacBook?