I miss a real ESC key. I can’t tell if I’ve pressed it or not, which is problematic when using vi and touch typing. Haptic feedback would be a nice add-on to make it a little more tolerable.
Also, Apple’s default configuration with Siri in the upper right was a horrible design decision. It only took me a few hours of use to decide to reconfigure the Touch Bar’s layout.
I found it interesting that even an Apple Genius Bar employee was recommending a third-party app to me: BetterTouchTool.