"When I am at a desk, the lid is closed so both TouchID and touch-anything effectively don’t matter, including any display information."
"And hopefully the ENTIRE Touch Bar display is also available as a global window ON the screen so that it is still able to display/activate things when you are lid-closed connected to an external display."
You make a good point. I can imagine adding a Touch Bar to keyboards. That doesn't address the TouchID button, but I believe that might addressed with tech like the Apple Watch or iPhone.