The original post has a small point, but ultimately the dying dummies are there for your convenience, if they where removed we would loose that convenience, and dying would revert back to being a very difficult and expensive thing to do. With the added ability to dye parts of the clothing/armour colours that you would not ordinarily be able too, because the appearance modifying was set to Cloth/Leather/Metal, removing the dummies would make dying clothes/armor a very laborious affair, with lots of trail and error, it would also be prohibitively expensive for many characters.
At one point we used to have to buy individual pots of cloth, leather, and metal dyes. In which you had to guess which part of your clothing was cloth/leather or metal, and this was very impractical to keep track of.
Removing the dummies and going back to this wouldn't bring any positive change, so while I think there is some merit in saying that the dummies are a little inconvenient to explain IC, the alternative would be heavily restrictive, and would be a step back.