Adding a post to this... I was reading your posts on the last several pages... Like this one
The problem arises when the tank does more damage than the dps. Very few current balanced games have tanks out damaging dps though tanks do solo better in this game the different is substantial. Destruction is pure crap cuz it does too little damage and requires too much mana.
In balanced games like league of legends/ect the spell casters like ryze to so much burst damage but have very little life while the tanks like malphite do little damage but survive to much better. The tanks here do more dps, burst damage, and tank much better. This is the problem I"m emphasizing.
Here is your issue, defined: This is not an MMO.

All your language - tanking, face-rolling warriors, tanks out damaging dps... those all apply to multiplayer games. It doesn't matter here - I mean, character build matters, but not in the way you are trying to shoe-horn it to. Think differently as you play this game. It's a single player RPG. You play the character, not the templated spec.