If Apple keeps it, they will improve on it to the point where it doesn't suck.
To fix that, one would need to rework the whole OS and applications in such way that they don't use F-keys at all, but rather something else.
So, fixing Touch Bar means rethinking OS and application shortcuts.
I don't think average users really use F-buttons that much, but we developers generally do.
I agree with the feedback, but I'm certain they will add this.
The older macs, you could have f-key 'default' with the other options activated by holding the FN key, or reverse it, so that the brightness/etc were default, and f-keys activated by holding down the FN key.
There is no option to just have f-keys defaulted, with other touchbar stuff activated by FN key. For people who simply want standard f-keys as default all the time (like you could have in the previous macs), there is no option right now.