Just, why not? It doesn't seem difficult to make two different types, it's not like the model changes. One with the enchantments, and one without. It seriously ruins my roleplay when I can't use certain pieces of armor because they simply have terrible enchantments, or the enchantment simply doesn't suit my character.
This is a roleplaying game after all, and it would greatly improve roleplaying to have little things like these, and I don't rant often like this, but this seems like the easiest thing to add into the game. Hell, there are even files for non-enchanted Novice Robes, but they aren't in the game for some reason.