1. The trackpad on it is so god awful that using any sort of multi finger gesture is a non-starter. In this case the touch screen works significantly better.
2. I wanted to draw in a whiteboarding tool. Drawing with my finger is not ideal so I tried a passive stylus. Drawing with a passive rubber-tipped stylus leaves a lot to be desired. I would much rather use an active stylus or a pen display for artists if I could.
Apple is known for the best trackpads. They have set the bar high and they have consistently met that bar for over a decade. I don't need a touch screen for gestures when their trackpad feels just as good. To my next point, there is no pen support on this screen.
Given this, I feel the touch screen is going to be seen just like the touch bar, a pretty feature that receives some good niche support, but ultimately does not align with how the majority of users use a laptop. I just hope there's an option to turn off the touch screen when they inevitably start shifting this display down to the base model.
probably the only reason -- and this is mitigated with a mouse.