See Edit:
I never said that they are less protected - they are EXACTLY the same. Just pointed that out. Because you people just don't get it that destruction the other attacking skills have nothing to do with anything other than ATTACKS, and constantly derail the destruction vs weapons discussion into mages vs warriors... the problem is not with mages being weaker than warriors or archers, it's Destruction being out of balance with weapons... how long before you lot get it?
Smithed daedric bow will do around 150 damage. Add in weapon and armor enchantments, 400 damage. Add in that practically every attack is a sneak attack, 1200 damage. Notice how I am not even using alchemy...
Now you quit talking out your ass, go to elementary school and learn some math...


And magic resistance poisons require a weapon to apply them, let's ignore that one too.... ohh how very convenient... 
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As a mage you dont need health you can evade arrows from a distance with ease and just dont get into the range of meele fighters. Even if you get near you can still cast a flesh spell and with the alteration perk the max non-master one can go up to 300 AR points thats like a normal smithed (100 skill + perk) heavy armour with some perks - dualcast and with perks it can last longer than the fight itself.