Well, these have physical buttons pre-touchbar, so the touchbar is definitely slower since it requires two clicks (one to summon the slider) and you have to look at it instead of just feeling it.
I can't do the former, but I can absolutely do the latter. I can change the volume and brightness without looking down, and do so all the time.
Maybe I'm unusual, but I don't think I am—it's not that hard to learn by feel which keys are towards the opposite ends of the top row.
What I can't do without looking is access the middle keys, namely F4–F9. If Apple wanted to put a touch-bar there, I'd find that perfectly acceptable—I wouldn't consider it a downgrade, at least. The bar would be pretty small by that point though.
I'm sure the lack of a touchbar is very annoying to people who have taken such a class but I'm skeptical that most people, or even a significant portion of developers, have taken computer typing.
I went with a 13" Air this time around. I still have physical function keys, and the fingerprint reader which I like.
Unfortunately, I'm still subject to the quality problems. I'm four months post-purchase, two weeks out of my first keyboard repair(!), and my caps lock and Q keys are already starting to go. :(
The biggest thing I miss about tactile keyboards (on a phone, anyway) is the no-look interaction without necessitating input. Maybe tactile navigation is the term. RIP HTC Tilt2.