Why do we not default back to auto-attack?

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anubite wrote:

If you are wielding a weapon and run out of mana, you default to the default attack.
If you are using spells, you do not.

The reasoning for this is simple)

1) there are radial area spells (like ice nova) that have no 'target' so it would be really dumb if they defaulted to the default attack
2) spell-casters often have next to no accuracy and often times an awful weapon (perhaps even a melee weapon, like a staff or a dagger); they don't want to swing their weapon stupidly when they might prefer to run away and regenerate mana

It defaults for attackers because they do have a weapon and chances are they would like to be able to swing it in case of an emergency where there is no mana.