A cloth wearing mage should be able to at least sneak better than someone in medium armor. I recognize rogues use stealth + med. Lets take a look at victim tanks that take a hit to damage in order to protect, while casters take a hit to armor in order to have 'mobility'. so then you mix the two and get nothing but benefits from both sides. med armor, protects and increases mobility. That statement makes no sense and creates a completely unfair middle ground for people that gravitate to either extremes.
So, then you mix the two and get something that protects a little and offers maneuverability, while relinquishing some mobility and armor.
"Jyggalag's forces are gathering in the Fringe...And I HATE IT when people gather forces in my Fringes!" - Sheogorath