It's pretty much the same as the difference between a car where the air conditioner and radio knobs are a touch screen vs. being real knobs that you can safely adjust while driving.
I would still prefer a physical function row, but it’s not that big of a deal. And actually some of the controls on the touchbar are really nice, for example the volume and brightness controls for changing all your connected displays at once.
I suppose it's just a matter of personal preference and habit, though. Maybe some people have trouble aiming? I really thought I'd miss the tactile feedback (as has been the case with similar touch devices for me in the past), but in this case, I don't really notice it.
* Distance to caps is 1-key
* Distance to touch bar ESC is ~3-4 keys, which is quite a bit to travel for a pinky and for me even requires forearm movement. But this is the same, touch-bar or not, so I've been remapping since before the physical ESC disappeared anyway.
This is a bigger deal for me because I use vi mode on my terminal and so I hit ESC all the time in the terminal.
Also I use Dvorak, so 70% of my keystrokes are already on the home row, so moving off the home row for something so common as ESC is much more noticeable.
Lastly - who the hell uses caps lock anyway? For short words like ESC, holding shift has now become second nature. For longer things I often type it in lowercase, select in vim, then use `U` to convert to uppercase. For not-in-vim uppercase on the internet: I just don't shout. :P
Caps lock is superior to the original escape key location, though, IMO.