With that line of reasoning we arrive at the conclusion that all graphical elements of an interface should be removed, as the blind cannot see icons.
> If your UI requires someone to discern between the red and green versions of the same icon
Color coding has never been about this, only when implemented wrongly. It is just an extra differentiator for GUI elements which are already differentiated by icon shape and text labels.
> Color coding... is just an extra differentiator for GUI elements which are already differentiated by icon shape and text labels.
In principle, I agree, but I do not believe I have ever used a software package that follows this philosophy. In practice, once you give people a tool, they are inclined to use it, and most projects only try and address accessibility concerns post-ship
> If your UI requires someone to discern between the red and green versions of the same icon
Color coding has never been about this, only when implemented wrongly. It is just an extra differentiator for GUI elements which are already differentiated by icon shape and text labels.