FLAME WAR ALERT!!!
Thanks Christoph.
The whole point of this thread was to instigate a flame war and express what we think about the Touchbar.
I think it’s a joke, but I’m also curious to see what others think. Touch screen is where I think it’s at.
If there’s enough people thinking the Touchbar is here to stay, I may add support for it in my apps even if I don’t use it.
I must add that while I want to encourage discussion, I don’t want to see people bashing others for a difference in opinion.
I just got the new MBP and the TouchBar looks very clever. I think I’ll use it, just don’t know how much. I will add support though.
You may not get many useful answers because a limited number of people own a MBP with a TouchBar ?
Some people must have the TouchBar on hand to get ideas on how to use it, maybe ?
Also, to push your brain (for getting uses for your own application), one may have to watch what others done in their own software.
What was (still is) the use of the good old Function keys ? I rephrase it: what Function keys did you used lately ?
I am trying to think at some use, but all I get is replacements (of current UI objects to remove for example, the ToolBar at the top of my windows to get more height) or remove ContextualMenus and present them in a more fashionable way in the TouchBar.
Sam: this is brainstorming on a concept: how to I go from the concept to something useful in real life ? (real use, everyday use of the concept).
And, you are right, sectary ideas does not help.
I just recall something from the McDonald 21" (vertical) command stations:
the left part of the screen (where I put Listbox selector for example), they have (large) icons of menus, drinks, etc. You can move them (just like if there is a circular object) using one finger in both top to bottom / bottom to top.
But, the TouchBar is not taller enough for that.
What about an horizontal selector just like what we saw sometimes on web sites ? Doing so will allow you to present the contextual functions (in the default area) and move to left / right to find other functions ?
In a text editor you will have the Edit buttons by default , followed by styles, color selection [Text / Background], etc., then a left move will show File (Open, Save, Import, Export, Print, etc.), a right move will show text controlers (Syntax, Grammar, Dictionary,
)
The contents will not be revolutionary, but concentred in a single location, but burried in an all-purpose location.
At the beginning was the text based computers.
Then comes the Graphic interface (Windows, Pulldown menus with shortcuts, Mouse).
Then comes the TouchPad (grand son of the TrackBall, TrackPad, etc.).
Then comes the ToolBar at the windows top.
Now we have TouchBar and Sam asked ideas of use.
The five lines above shows some consistency in the user interface. And if we know enough (or are old enough to recall), all of these raised question on their uses:
a Graphic Interface ? What for ?
TrackBall? What a stupid idea: an inverted Mouse with the ball on top !
TrackPad ? What a stupid idea: a game toy for working purposes ?
A TouchPad ? How can I use that ? Give my Mouse Back !
and so on.
Then, with time, we figured out how useful these additions are to the computer use.
When you do can you share what you put in the Touchbar? i.e. what controls and why.
Great. We will at last have control keys in macOS apps 
The issue for the moment is that it is found only in two laptops. If Apple generalizes it, then it will be here to stay, and worth making the effort to support it fully.
The TouchBar is a nice feature indeed. Is it a revolution as Apple would tout it ? Not quite sure.
This recalls me the CD intro
hardware manufacturers tells There is not enough available music titles to release new hardware and (I heard that while I was working at CBS then, Sony Music today): we will release more, far more titles when enough hardware will be available ;-
Sam:
Sold visual time on the TouchBar: put advertising there ;-
Comparing a gadget to a full fledged delivery system such as CDs is more than far fetched.
The TouchBar is nice, but it is nowhere near indispensable. At least until there are apps that rely only on it. And then, if it was to ever be attempted, I believe they will be completely off HIG.
The CD was a true revolution. The TouchBar is just a nice addition to the keyboard.