Do you find that you can use the touchbar without having to look at it? For me I can press the volume up/volume down buttons without having to take my eyes off the screen. Plus the volume increases and decreases with a constant interval. At this point it's pure muscle memory for me to adjust volume and requires no thought. With the touchbar slider I have to physically look down and put the slider to where I want. For me pressing keys is easier than moving a slider and it's faster.