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.