Being a former QC owner, I can say that in my opinion a touchscreen would be a very welcome addition to the Kemper world.
The touchscreen on my QC was very responsive. I didn’t have any of the problems that people here are worrying about.
And it could be optional, of course. If Kemper implements a touchscreen, I hope they would make all the functions available via buttons and knobs as well, for those who do not like to use touchscreens.
i haven’t tried a QC (and actually have no desire to) but one thing that did strike me as potentially very good design was the way that the footswitches all serve a dual function as physical knobs for data entry.