I agree, the Touch Bar gives all the contextually appropriate benefits of multitouch without having to place your hands in an un-ergonomic angle, and mark up the screen. It seems to make a lot of sense to me, however in addition to the touch bar, including a full multitouch monitor would be nice for those who insist on poking at the screen. And seriously, now that we have a giant trackpad why no support for the Pencil??
Ergonomics is not a problem. Just put it like this (left):

I absolutely agree with Jony Ive that a touchscreen laptop or desktop is not a great or particularly useful idea when you have a big, beautiful trackpad like you do on MacBooks and MacBook Pros. This is simply a question of ergonomics. Do I want to be using a touchscreen with my arm extended in front of me? Not really. Touch input is much more comfortable and useful when the positioning of the input device is more-or-less parallel with the floor.
Honestly I am very impressed by Ive's sentiment with respect to finding a balance between the mechanical and the adaptable and think it is a highly reasonable approach.
See above.
"Touch surfaces don't want to be vertical" - Steve Jobs