Well having shortcuts to stuff that you don't want to have to trackpad up to and click every time, or remember keyboard chords for. Same purpose as function keys, but without the memorization necessary to use them.
To the context it was used. Apple apps take full advantage of the touchbar. Adobe is finally doing the same. Not all pros are the same and you can turn off its override features in the system preferences. Not all revolutions are immediate.
I laughed when they showed the music professional using the touchbar to scrub through audio/video. like any pro is using anything less than a whole another macro keyboard to handle that issue
So now I have a touchbar that I can't do anything with that I couldn't already do before it.