Create keyboard shortcuts for touch bar’s functions

The keyboard shortcut you refer to was actually only one of two keyboard shortcuts that worked the same way. The other one was to use ControlOptionCommand and the Eject key instead of the Power button.

Regardless, both of these keyboard shortcut combinations will quit all apps and shut down your Mac. Of course, if you have any open documents that have not been saved you'll be asked whether you want to save them.

Since you have a Touch Bar model, I suspect you will just need to ensure you're in the right interface to see the Eject key option.

Otherwise, what actually happens if you still use the ControlOptionCommand and the Power combination, remembering that in your case the Touch ID doubles up as your Power button?

If there is no way to get that to work, you could add your own custom keyboard shortcut to achieve what you want, but that will mean changing some of the other Function Key behaviours - if this is an acceptable option and you need assistance to do this, let me know and I'll update this answer.

[UPDATE]

As requested via comments, here are the steps to creating a custom keyboard shortcut using one of your Function keys to replicate the ControlOptionCommandPower button combination:

1. Go to System Preferences
2. Select the Keyboard option
3. Ensure you are on the Keyboard tab
4. Make sure that the Use all F1,F2, etc. keys as standard function keys is not ticked
5. Now choose the Shortcuts tab
6. Select App Shortcuts in the lefthand column
7. Click "+" symbol at the bottom of the right pane
8. Leave the Application drop-down as All Applications
9. In the Menu Title field type this in exactly: Shut Down...
10. In the Keyboard shortcut field press the fn and F1 keys
11. Click on Add
12. Exit System Preferences

Now you should be able to just press the fnF1 key combination to shutdown your MBP.

NOTE: The reason at Step 4 I wanted you to ensure that the Use all F1,F2, etc. keys as standard function keys is not ticked was because you wanted to set the keyboard shortcut on a key that is already used for something else. However, if you do want to leave Use all F1,F2, etc. keys as standard function keys ticked, you can change the original F1 key shortcut to something else first and then set the F1 key (without the need for the fn key) as your keyboard shortcut.

Any questions, just ask.

The new shortcut is Command-Dim Brightness. It even makes sense in the following way:

Assuming that you take advantage of the touch bar, and it displays the system controls instead of the function keys then the hand gesture is exactly the same as before when you would have pressed Command-F1 since the Dim Brightness button is where F1 would be:

The annoying thing is that if you have an application-aware touch bar configuration, then you have to bring up the system controls touch bar configuration first.

This is why, in some cases, the Display Menu (in the App Store) which adds a status item in your menu bar (and includes a Mirror Screen choice) is a good option.