I used to think that was what I wanted. But I think at this point a thin laptop can be good enough, and being able to get away from having a dev laptop and a travel netbook is a huge win. Moving all the ports onto a dock - provided it's a first-party fully-supported dock - is also a win, since it enables me to leave everything plugged in at home and take my computer travelling without having to unplug and replug everything.
/huge Surface Book fan