Dizzy, it's not the COLORS that are bad, it's the breeder behind the colors.
If a certain color cannot be shown, quality cannot be assessed. If a breeder is only breeding for a DQ color, chances are good that they're breeding FOR color, not all the other traits and attributes.
Yes, there are "white" dobermans. Yes, the color is a DQ. Yes, I am against the breeding of these "white" (albino) Dobermans.... because there are no responsible albino breeders. There can't be - no good breeder would breed a dog with an increased potential for skin cancer, photosensitivity, and a while other slew of problems associated with them.
As for these DQ colored Ridgebacks.... who knows... maybe the color is linked to other things, like an increased occurence of dermoid sinus. Who knows... maybe these colors have the potential for the dog not being able to do its original job as well as the normal colored ones. Perhaps the DQ only exists to keep the breed looking like what the standard requires them to look like. The breed standard is there for a reason. Perhaps the Ridgeback fanciers know something about the DQ colors that we do not, or perhaps they have noticed certain trends within these DQ colors that make them undesireable.
As an owner of purebred dogs, I do not think breed standards are stupid. They exist for a reason. Perhaps not any reason you appreciate, but I assure you that those of us who love our breeds, and want to make sure they don't disappear, or take a huge step backward in overall quality... well, we feel differently.