I think, similarly, a touch bar in addition to a full keyboard would be useful.
With the exception of the ESC key, with I use a lot, I’m not sure I’d miss the rest of the function keys. The idea of a touchbar seems like it could work if done right.
Did Apple do something wrong or it just doesn’t work in practice?
The Touchbar is a good idea, though it's not a killer feature - mostly because of issues with Apple's software support for it (same story as Force Touch). The biggest issues with it are the lack of a physical Esc key (a mistake, especially because the virtual Esc key is broken in some apps), lack of tactile/haptic feedback (BTT actually has an option to shake the force trackpad as a haptic feedback substitute), and poor customization support (you can show app-specific keys or "control strip" keys, but can't mix the two - there are artificial limitations to what's available created by Apple's idiosyncracies).
I makes it nicer to adjust system settings (brightness, etc) and has helped me with new shortcuts in several apps that I use regularly but not daily.
Biggest con is the escape key, I mapped Caps Lock to esc and haven’t looked back. 2nd biggest is that you have to look at the touchbar to hit the “keys”, but I was never able to touch type function keys on laptops anyway so that doesn’t affect me.
The problem with Touchbar is the tooling. Get something like BetterTouchTool and it changes everything. You can customise buttons for each app and each button can link to a menu item or perform a sequence of commands.
In the end, I don’t mind it being there, but it’s not useful enough to swap physical buttons for. It might be different if they add haptic feedback and Force Touch.
Though, I’ve been running Catalina for some development work, and have found Touch Bar to make a lot of sense in Sidecar context (where you cannot use finger to navigate around, but it shows the Touch Bar at the bottom, so it sort of become the primary navigation for touch)
Use it as a touchscreen numpad / macro interface with context changed around the ‘focused’ application running on OS X.
Come up w cutesy mounts for desk, traveling, etc.
Or, get rid of the mechanical keyboard and touchpad, and make the entire bottom half a lower fidelity touchscreen.
Mostly thinking for the fingerprint reader. Don't use the rest of my touchbar.