Spell damage is pre-scaled. It's amusing that you don't understand this.
Let me repost something for you:
Let me explain the mages situation to you.
At level 40, they are done with their power. they cannot get any more powerfull spells, they are locked at a strength.
The enemies keep on getting stronger
Now, a mage's max damage is 100.
A warrior's max damage is 3199.
A warrior can also get armour above 2.4k
So, with the mage's destruction spells locked at one amount, the enemies keep on getting stronger.
I have heard of mages using 3/4 of their magic on a single -regular- enemy.
And the Conjuration summons never get stronger, so eventually their HP can be wiped out by everything.
The max armour a mage can get with alteration (i belive) is 100.
The max armour a warrior can get is 2469.
There, do you all understand it now?