I should clarify.

Certainly, there are things that the app does that are inconvenient, or perhaps impossible, to do from the pedal, like detailed MIDI mapping, organizing preset lists, etc.  But I think the basic things you would want to do live—tweaking and saving presets, even adjusting the expression pedal—are quite doable from the pedal.  I don’t mind the XYZ/big button system, others may disagree.

My point was that I frequently hear people say they must have/bring a laptop/iOS device to even use the pedal, and I don’t think that’s true.  I never use the app live, only at home for adjustments.  Given that, I find it hard to believe that there are that many people who only use Android/Linux devices—no PC/Mac laptop, iPad, etc.  Unless that is the case, then one could use the app at home and use the pedal interface live.  Again, I realize it may not be as convenient, but it should be reasonably functional.

Just my $0.02.