I think the problem with touch bar was that, it completely replaced the function keys, instead of complementing them. Other than that, I actually liked it.
Another issue with the touch bar is that part of the laptop gets quite hot (especially on Intel CPUs), and so did the touch bar. I recall a few times feeling like I burned my finger just pressing esc during video rendering.
I think the lack of haptic feedback is what doomed the Touch Bar. If they'd been able to solve that problem, it could have been an acceptable replacement for the function keys.
That.
And I had to look down every time I had use it. I am glad to see it go.
Hah, that reminds me! My first work issued Mac didn't have the ESC key, just the touch bar. IIRC a program hung in fullscreen, freezing both the app and the touch bar. So I had to reboot to get out of it because the esc key didn't work.