I don't keep an index of the discussions here, but a quick trip to Google brought up several points that have been discussed here, including those made at these two links:
http://www.imore.com/how-the-touch-bar-improved-my-mac-productivity
http://www.huffingtonpost.co.uk/thomas-grove-carter/one-professionals-look-at_b_12894856.html
iMore writes about:
1) Tab Skimming
Nice to look at, I will give you that. But still, I will do it better, faster and without looking by using shortcuts. So does it improve functionality? Nope.
2) Touch Bar-Assisted memory
Again, bashing keyboard shortcuts. And he forgot to mention that you can edit keyboard shortcuts so that they are same in almost every application you use. And it's quite easy to do.
3) Spelling suggestions
Well, with this one I do agree, but autocorrect and spell checking as a decent alternative.
4) Interface de-cluttering
Lol. In most apps, you can't even remove some of the toolbars. I know, coz I would love to remove almost all of them and simply use keyboard shortcuts.
5) Touch ID
Well, this one is great. But it has nothing to do with TB, Apple can put this in even without touch bar.
My conclusion:
Everything a touchbar brings, we already have. It's called keyboard shortcuts, and it's way faster then TB. You don't have to look away from the screen, keyboard shortcuts stay the same for every similar app unless you change them, and Pro users tend to learn them and use them.
TB is useful if someone is a noob for a particular app. But then again, he won't learn keyboard shortcuts, so he will stay less productive.
I asked for something new that TB brings to the table. Reading iMore i get the point. TB is replacement for keyboard shortcuts. And it's slower and less productive then keyboard shortcuts. Uses way more battery life, kinda hard to see in the sun, and the resolution of the TB is not great at all.
Again, I simply still can't see any compelling reasons to use TB over keyboard shortcuts. And besides using TB as less productive version of keyboard shortcuts, there is absolutely nothing that TB brings to the table.