Being a music producer, I had to remap volume up / volume down to the physical keys - CMD+[ and CMD+]. .. anything touchbar related is a huge pain. So many accidental touches, or on the other side non registered touches when you need to change the volume or anything else. Physical keys will be the godsend.
Not to mention, you can't lay down your fingers on the touchbar and be ready to touch the key when you want.
For example absolutely necessary - "Show Desktop" in mission control, is now not possible with touchbar. So had to remap it again to CMD+§.
I hate it so much, I can't even describe how bad it is.