Not once in all this back and forth did anyone say “only from the front panel of an AxeFX”, just blanket statements about how hard this would be with a Fractal unit.
No, it's about general ease of use. And the Kemper still wins here, hands down. It wasn't even about whether things were possible on other units. They are. Since decades. But only Kemper managed to make it an essential part of the UI-experience.
Let alone that not only setting things up is as easy as it gets, it's as easy to alter things shouldn't you be happy.
While I have no idea how things are in FAS land (would depend on whether these movements are 1:1 parameter movements or could as well be offsets, which I just don't know), with the Helix (and pretty much all other modelers), it's like this: Once you've assigned a parameter to a controller (doesn't matter whether it's MIDI, internal, a static switch or a continously moving pedal), you're losing the option to adjust the target parameter directly.
As an example: When I control, say, a delay's mix parameter with an expression pedal and then set it to 10% min and 50% max, any adjustments straight on the target delay mix parameter would be overwritten as soon as you move the pedal (as it's a direct 1:1 control). So, to adjust anything, you'd have to get into your modulation/control/whatever menu and alter the min/max value there.
Now, this could as well be done differently, as is common practice with many synths and their modulation matrixes, which only control "offsets" of any parameter, but as said, this is nothing that exists on any modeler I ever had my hands on (it might exist in the FAS universe, but I had other things to do when I had an Axe FX borrowed, so someone else would have to set things straight here).
Anyhow, with the Kemper, this is pretty much a non-issue. In case you want to edit any of the "extremes", all it takes is to select status A or B (it's not called that, but you'll get the idea) and alter the target values straight on the target parameters.
Anyone claiming that any other currently available method on any other modeler is as comfortable to deal with should really check it out on a Kemper. Check it out in the manual beforehand (easiest read ever), after that you'll be able to do it on any unit you may get your hands on instantly. The only thing possibly requiring some menu operation is when you want to assign an EXP pedal to do the morphing, but that's a one-time affair per patch only.
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