I think one issue could be that if you have a high gain patch, and program that in to the red mode, touching the level knob can cause a huge jump in volume if the physical position is a lot higher than the programmed level.
None of this is an issue for me, as I only use green mode now. I have 3 presets that are all set with the same level knob position.
Oh yeah, I could see that being an issue.