I have a question regarding weapons. You can only use weapons whose value is equal to or less than the skill you're using, and if you use a weapon with a higher value, you only do the damage you cast with the skill. So, why put such a high damage die on some weapons if you can only cast the damage with your skill die? I have that question.
For one, Special Items and species traits aren’t limited by this.
But for other weapons, the limit is meant to balance might and agility against the other stats. As you play you might increase your might or agility through special item upgrades, or through promotion, in that case you can roll higher dice as you progress. Hope this helps!