Keyboard shortcut for powering down MacBook Pro with Touch Bar?
In System Preferences → Mission Control


Change "Show Desktop" to F10
Change "Show Dashboard" to F11

In System Preferences → Keyboard, open App Shortcuts.


Click + to add a new shortcut.
Leave Application as "All Applications".
In Menu Title enter exactly this phrase (without quotation marks): "Shut Down…"
Click cursor in the Keyboard shortcut field, then on keyboard hold "fn" key then select "F12" on Touch Bar






Holding "fn" key and selecting "F12" on Touch Bar will bring up the shutdown prompt.
Holding "fn" key and selecting "F10" will show desktop, holding "F11" will show dashboard.