- I can't adjust the volume without looking at it. Because the touchbar is flat with no haptic feedback when I land on a button, it's hard to remember the exact position of the volume 'button' without looking. Sounds trivial - but combined with point 2....
- The way the volume control expands - it actually moves the 'volume down' button AWAY from your finger, which again requires me to keep looking at the control.
This means that when a loud song comes on, it can take 2-3 seconds to quickly turn the volume down in total. I could do that with one single keypress in half a second or less on a keyboard, without needing to look at the keyboard.
That can also be the difference between missing a key detail from a quiet speaker on a Hangout.
Flashy, but it's a terrible user experience by every metric other than looks, I guess.