Considering that there are no hoods to match what few unenchanted robes there are (blue, black, monk, college, and vaermina), hooded robes are the only way to achieve the classic "hooded wizard" look without wearing the standard pre-enchanted skill robes set. Unfortunately, the appeal of hooded robes is sullied by the fact that they take away one (potentially two) enchanting slots.
Now I'm no "powergamer" who obsesses over maxing everything out, but this is still bothering me. The cost of Destruction is stupidly high, and having that extra slot (or two) is far more important to a mage than any other class.
In short: either give hooded robes enchanting slots of two items, or make some matching hoods.