People putting points in dual wield are simply doing it wrong. Dual wield is additive with strength or whatever you are using. The formula goes like this.

Stat + Dual wield or 1 hander or ranged etc.

X

Elemental damage (warfare is elemental bonus for physical, like Hydrosophist is for water).

X

Crit bonus + high ground bonus if you get it.

If your mages are sucking, you are building them wrong, just like the melee character that isn't taking warfare.

As a mage, you have two primary stats. The stat for your element, and Huntsman. If you max both of these, Your area of effect spells will wipe out entire groups of enemies.

How do they fix this and make it more intuitive? I don't know. They would have to revamp the entire system.