> I decided to steal this feature and make the "coffee break" button. It locks the laptop and switches the screen off.

Ctrl+cmd+q = lock screen. Display will dim/sleep shortly after that. (Found this out myself not too long ago, I think because of HN).

Incidentally, I just switched the touch bar to the standard function key display with fn switching to the buttons just like the keyboards of old. I found I almost never look at the touch bar and there's absolutely nothing I found that it added that I couldn't already do with the old setup. I hate that the escape key is no longer where it used to be (fully left-aligned). I also hate on the new keyboards that the left and right arrow keys are so big. I use the space on the smaller keys of my old keyboard as a tactile indicator of where my hands are (perhaps it's finally time for vim?).