You see, that's not how it works. When you type blind, you rely on the edges of the keys to find your way around the keyboard. That's also why the f and j keys have that funny protruding line on them: when your index fingers don't feel that, you know you're in the wrong place.
Having an area where you can hit something you can't feel is just not a substitute for a key that I use as frequently as ESC. However, remapping the ESC key is.
From what you're saying, you can change the volume by keeping your finger down? Touch & slide immediately? That's nice. I didn't know that. That's one of the reasons I actually like the cnncept of the TouchBar. It has the potential to do a lot of nifty things. Whether the potential has already been achieved is another matter entirely