I so totally disagree. It is like the Telvani would build their strongholds in a way that would make it impossible for you to get to them unless you were a mage that could levitate. Quests were dependent on magic and you not being able to complete them as a dumb brute was part of the experience. Now everyone wants to do everything with any build and that is lame. There should be quests that you simply can’t finish as a pure warrior or a pure mage.
http://www.youtube.com/watch?v=m_mDTLphIVY
I don't want to do everything at all. I want to play as a warrior who has no magical ability, but hunts down legendary enchanted items to make up for it. This quest is perfect and would give me great and much needed help playing on master difficulty. I should not have to learn magic just so I can complete a quest that has nothing to do with the College. The irony is, you are contradicting yourself.
And yes, I agree, there should be many quests that you cannot finish as a pure mage, or a pure thief, etc. Those quests should be a part of their respective factions - not the side quests in the game.