I may be wrong but touch screens are often color LCD screens and they are dark on stage. I think KPA philosophy is to get stage guys the most practical tools like bright readable display.
The touchscreens on the TMP, the Quad and the Ampero are honestly pretty lame. If you are looking for the easiest on the fly iOS it’s on either the helix (with its capacitive switches) or the kemper toaster (or less so the rack) with off the floor real time buttons and switches. You do have to spend a bit of time learning the ui, but once you do, the touchscreens become nothing more than a pretty looking add-on. A small example. On any of the above touchscreens editing anything on it takes 2 moves on an often unresponsive screen before getting to the controls. On a helix, touch a foot switch and you’re there On a Kemper, program the unit and the knobs are right in front of you. If you need a touchscreen, a mobile device is much better anyway.