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The CC has dozens of options, settings, groups, channels, metering, etc. It's all controlled by two buttons using up, down, left, right, or in. How much more simple can it get without losing features? For it to be touch screen, it would have to be much larger and more expensive. Everyone would complain about that.
Straw-man argument. Nobody asked for it to be a touch screen.
And it's not simple. I'm an engineer and have no problem with it's user interface. However, today did an outdoor session. Right away, I couldn't see the menu because of the bright sunlight. I couldn't even tweak the brightness because I couldn't see the menu. So I go to turn the light off standby. Doesn't work. Turned the flash on manually. Tried to tweak the power from CC. Goes right back into standby. Finally did the shoot without the CC. When I got back indoors and could read the menu, I see that the setup menu was on Modeling Light Mode instead of Standby Mode so when I tweaked the parameter to get it off standby I was actually tweaking the modeling light setting.
Sorry but it's not a good user interface for location lighting. It's a great interface in the studio but the screen is too small.
And you just made my point for me. Dozens of options, settings, channels, metering in a 1x1.5" screen is not good UI design. Anyway with any experience using or developing small devices (as I do for a living) knows that.