It's not just about having a touchscreen. You can try the Fractal Axe-edit UI with a touchscreen using a 3rd party tool called FracPad. Now Axe-Edit is one of the better computer editors but just translating it to a tablet, it doesn't work that much better. It's still a reverse-engineered version that lacks polish, and works with the existing paradigms of Axe-Edit. I hope Fractal have at least hired its developer to work on mobile editors for next gen.
Touchscreen + knobs is the way to go so you have tactile control over parameters like Stadium does. Line6 also has the controls in a consistent location at the bottom of the screen, whereas on Fractal each view can be different on the front panel UI, which means you have to reorient yourself all the time with a little "ok now where was that param I want?" mental exercise.
Helix has had a similar issue where the parameter order is inconsistent. If you are looking for a Mix knob in several effects, it might be the Nth param in effect 1, and the N+1 param in effect 2, and N-2 in effect 3. I hope for HX Stadium they would fix that so you can expect common parameters to be found under the same knob for consistency.
Fractal's challenge is to simplify their user interfaces so that they fit on a larger touchscreen while allowing for fast movement between blocks. That's currently the difference between Axe-Edit vs their onboard UI, you can just click any block to open it up for editing.
The onboard UI requires you to painstakingly move a cursor over it, hit Edit, find the right page because it defaults to model list etc. Or alternatively spam Edit until the right block is on screen. The cycling order with multiple rows is always column -> row so you go e.g Amp1 -> Amp2 -> Cab1 -> Cab2 if you have dual amps/cabs in parallel, when a more sensible order would be via connection (Amp1 -> Cab1).